xref: /external/chromium_org/cc/trees/layer_tree_host_unittest.cc

// Copyright 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "cc/trees/layer_tree_host.h"

#include <algorithm>

#include "base/auto_reset.h"
#include "base/synchronization/lock.h"
#include "cc/animation/timing_function.h"
#include "cc/debug/frame_rate_counter.h"
#include "cc/layers/content_layer.h"
#include "cc/layers/content_layer_client.h"
#include "cc/layers/io_surface_layer.h"
#include "cc/layers/layer_impl.h"
#include "cc/layers/picture_layer.h"
#include "cc/layers/scrollbar_layer.h"
#include "cc/output/begin_frame_args.h"
#include "cc/output/copy_output_request.h"
#include "cc/output/copy_output_result.h"
#include "cc/output/output_surface.h"
#include "cc/resources/prioritized_resource.h"
#include "cc/resources/prioritized_resource_manager.h"
#include "cc/resources/resource_update_queue.h"
#include "cc/scheduler/frame_rate_controller.h"
#include "cc/test/fake_content_layer.h"
#include "cc/test/fake_content_layer_client.h"
#include "cc/test/fake_layer_tree_host_client.h"
#include "cc/test/fake_output_surface.h"
#include "cc/test/fake_picture_layer.h"
#include "cc/test/fake_picture_layer_impl.h"
#include "cc/test/fake_proxy.h"
#include "cc/test/fake_scrollbar_layer.h"
#include "cc/test/geometry_test_utils.h"
#include "cc/test/layer_tree_test.h"
#include "cc/test/occlusion_tracker_test_common.h"
#include "cc/trees/layer_tree_host_impl.h"
#include "cc/trees/layer_tree_impl.h"
#include "cc/trees/single_thread_proxy.h"
#include "cc/trees/thread_proxy.h"
#include "gpu/GLES2/gl2extchromium.h"
#include "skia/ext/refptr.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "third_party/khronos/GLES2/gl2.h"
#include "third_party/khronos/GLES2/gl2ext.h"
#include "third_party/skia/include/core/SkPicture.h"
#include "ui/gfx/point_conversions.h"
#include "ui/gfx/size_conversions.h"
#include "ui/gfx/vector2d_conversions.h"

using testing::_;
using testing::AnyNumber;
using testing::AtLeast;
using testing::Mock;

namespace cc {
namespace {

class LayerTreeHostTest : public LayerTreeTest {
};

// Two setNeedsCommits in a row should lead to at least 1 commit and at least 1
// draw with frame 0.
class LayerTreeHostTestSetNeedsCommit1 : public LayerTreeHostTest {
 public:
  LayerTreeHostTestSetNeedsCommit1() : num_commits_(0), num_draws_(0) {}

  virtual void BeginTest() OVERRIDE {
    PostSetNeedsCommitToMainThread();
    PostSetNeedsCommitToMainThread();
  }

  virtual void DrawLayersOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    num_draws_++;
    if (!impl->active_tree()->source_frame_number())
      EndTest();
  }

  virtual void CommitCompleteOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    num_commits_++;
  }

  virtual void AfterTest() OVERRIDE {
    EXPECT_GE(1, num_commits_);
    EXPECT_GE(1, num_draws_);
  }

 private:
  int num_commits_;
  int num_draws_;
};

SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostTestSetNeedsCommit1);

// A SetNeedsCommit should lead to 1 commit. Issuing a second commit after that
// first committed frame draws should lead to another commit.
class LayerTreeHostTestSetNeedsCommit2 : public LayerTreeHostTest {
 public:
  LayerTreeHostTestSetNeedsCommit2() : num_commits_(0), num_draws_(0) {}

  virtual void BeginTest() OVERRIDE { PostSetNeedsCommitToMainThread(); }

  virtual void DrawLayersOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    ++num_draws_;
  }

  virtual void CommitCompleteOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    ++num_commits_;
    switch (num_commits_) {
      case 1:
        PostSetNeedsCommitToMainThread();
        break;
      case 2:
        EndTest();
        break;
      default:
        NOTREACHED();
    }
  }

  virtual void AfterTest() OVERRIDE {
    EXPECT_EQ(2, num_commits_);
    EXPECT_LE(1, num_draws_);
  }

 private:
  int num_commits_;
  int num_draws_;
};

MULTI_THREAD_TEST_F(LayerTreeHostTestSetNeedsCommit2);

// Verify that we pass property values in PushPropertiesTo.
class LayerTreeHostTestPushPropertiesTo : public LayerTreeHostTest {
 protected:
  virtual void SetupTree() OVERRIDE {
    scoped_refptr<Layer> root = Layer::Create();
    root->SetBounds(gfx::Size(10, 10));
    layer_tree_host()->SetRootLayer(root);
    LayerTreeHostTest::SetupTree();
  }

  enum Properties {
    STARTUP,
    BOUNDS,
    HIDE_LAYER_AND_SUBTREE,
    DRAWS_CONTENT,
    DONE,
  };

  virtual void BeginTest() OVERRIDE {
    index_ = STARTUP;
    PostSetNeedsCommitToMainThread();
  }

  virtual void DrawLayersOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    VerifyAfterValues(impl->active_tree()->root_layer());
  }

  virtual void DidCommitAndDrawFrame() OVERRIDE {
    SetBeforeValues(layer_tree_host()->root_layer());
    VerifyBeforeValues(layer_tree_host()->root_layer());

    ++index_;
    if (index_ == DONE) {
      EndTest();
      return;
    }

    SetAfterValues(layer_tree_host()->root_layer());
  }

  virtual void AfterTest() OVERRIDE {}

  void VerifyBeforeValues(Layer* layer) {
    EXPECT_EQ(gfx::Size(10, 10).ToString(), layer->bounds().ToString());
    EXPECT_FALSE(layer->hide_layer_and_subtree());
    EXPECT_FALSE(layer->DrawsContent());
  }

  void SetBeforeValues(Layer* layer) {
    layer->SetBounds(gfx::Size(10, 10));
    layer->SetHideLayerAndSubtree(false);
    layer->SetIsDrawable(false);
  }

  void VerifyAfterValues(LayerImpl* layer) {
    switch (static_cast<Properties>(index_)) {
      case STARTUP:
      case DONE:
        break;
      case BOUNDS:
        EXPECT_EQ(gfx::Size(20, 20).ToString(), layer->bounds().ToString());
        break;
      case HIDE_LAYER_AND_SUBTREE:
        EXPECT_TRUE(layer->hide_layer_and_subtree());
        break;
      case DRAWS_CONTENT:
        EXPECT_TRUE(layer->DrawsContent());
        break;
    }
  }

  void SetAfterValues(Layer* layer) {
    switch (static_cast<Properties>(index_)) {
      case STARTUP:
      case DONE:
        break;
      case BOUNDS:
        layer->SetBounds(gfx::Size(20, 20));
        break;
      case HIDE_LAYER_AND_SUBTREE:
        layer->SetHideLayerAndSubtree(true);
        break;
      case DRAWS_CONTENT:
        layer->SetIsDrawable(true);
        break;
    }
  }

  int index_;
};

SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostTestPushPropertiesTo);

// 1 setNeedsRedraw after the first commit has completed should lead to 1
// additional draw.
class LayerTreeHostTestSetNeedsRedraw : public LayerTreeHostTest {
 public:
  LayerTreeHostTestSetNeedsRedraw() : num_commits_(0), num_draws_(0) {}

  virtual void BeginTest() OVERRIDE { PostSetNeedsCommitToMainThread(); }

  virtual void DrawLayersOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    EXPECT_EQ(0, impl->active_tree()->source_frame_number());
    if (!num_draws_) {
      // Redraw again to verify that the second redraw doesn't commit.
      PostSetNeedsRedrawToMainThread();
    } else {
      EndTest();
    }
    num_draws_++;
  }

  virtual void CommitCompleteOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    EXPECT_EQ(0, num_draws_);
    num_commits_++;
  }

  virtual void AfterTest() OVERRIDE {
    EXPECT_GE(2, num_draws_);
    EXPECT_EQ(1, num_commits_);
  }

 private:
  int num_commits_;
  int num_draws_;
};

MULTI_THREAD_TEST_F(LayerTreeHostTestSetNeedsRedraw);

// After setNeedsRedrawRect(invalid_rect) the final damage_rect
// must contain invalid_rect.
class LayerTreeHostTestSetNeedsRedrawRect : public LayerTreeHostTest {
 public:
  LayerTreeHostTestSetNeedsRedrawRect()
      : num_draws_(0),
        bounds_(50, 50),
        invalid_rect_(10, 10, 20, 20),
        root_layer_(ContentLayer::Create(&client_)) {
  }

  virtual void BeginTest() OVERRIDE {
    root_layer_->SetIsDrawable(true);
    root_layer_->SetBounds(bounds_);
    layer_tree_host()->SetRootLayer(root_layer_);
    layer_tree_host()->SetViewportSize(bounds_);
    PostSetNeedsCommitToMainThread();
  }

  virtual bool PrepareToDrawOnThread(LayerTreeHostImpl* host_impl,
                                     LayerTreeHostImpl::FrameData* frame_data,
                                     bool result) OVERRIDE {
    EXPECT_TRUE(result);

    gfx::RectF root_damage_rect;
    if (!frame_data->render_passes.empty())
      root_damage_rect = frame_data->render_passes.back()->damage_rect;

    if (!num_draws_) {
      // If this is the first frame, expect full frame damage.
      EXPECT_RECT_EQ(root_damage_rect, gfx::Rect(bounds_));
    } else {
      // Check that invalid_rect_ is indeed repainted.
      EXPECT_TRUE(root_damage_rect.Contains(invalid_rect_));
    }

    return result;
  }

  virtual void DrawLayersOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    if (!num_draws_) {
      PostSetNeedsRedrawRectToMainThread(invalid_rect_);
    } else {
      EndTest();
    }
    num_draws_++;
  }

  virtual void AfterTest() OVERRIDE {
    EXPECT_EQ(2, num_draws_);
  }

 private:
  int num_draws_;
  const gfx::Size bounds_;
  const gfx::Rect invalid_rect_;
  FakeContentLayerClient client_;
  scoped_refptr<ContentLayer> root_layer_;
};

SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostTestSetNeedsRedrawRect);

class LayerTreeHostTestNoExtraCommitFromInvalidate : public LayerTreeHostTest {
 public:
  virtual void InitializeSettings(LayerTreeSettings* settings) OVERRIDE {
    settings->layer_transforms_should_scale_layer_contents = true;
  }

  virtual void SetupTree() OVERRIDE {
    root_layer_ = Layer::Create();
    root_layer_->SetBounds(gfx::Size(10, 20));

    scaled_layer_ = FakeContentLayer::Create(&client_);
    scaled_layer_->SetBounds(gfx::Size(1, 1));
    root_layer_->AddChild(scaled_layer_);

    layer_tree_host()->SetRootLayer(root_layer_);
    LayerTreeHostTest::SetupTree();
  }

  virtual void BeginTest() OVERRIDE {
    PostSetNeedsCommitToMainThread();
  }

  virtual void DrawLayersOnThread(LayerTreeHostImpl* host_impl) OVERRIDE {
    if (host_impl->active_tree()->source_frame_number() == 1)
      EndTest();
  }

  virtual void DidCommit() OVERRIDE {
    switch (layer_tree_host()->commit_number()) {
      case 1:
        // Changing the device scale factor causes a commit. It also changes
        // the content bounds of |scaled_layer_|, which should not generate
        // a second commit as a result.
        layer_tree_host()->SetDeviceScaleFactor(4.f);
        break;
      default:
        // No extra commits.
        EXPECT_EQ(2, layer_tree_host()->commit_number());
    }
  }

  virtual void AfterTest() OVERRIDE {
    EXPECT_EQ(gfx::Size(4, 4).ToString(),
              scaled_layer_->content_bounds().ToString());
  }

 private:
  FakeContentLayerClient client_;
  scoped_refptr<Layer> root_layer_;
  scoped_refptr<FakeContentLayer> scaled_layer_;
};

SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostTestNoExtraCommitFromInvalidate);

class LayerTreeHostTestNoExtraCommitFromScrollbarInvalidate
    : public LayerTreeHostTest {
 public:
  virtual void InitializeSettings(LayerTreeSettings* settings) OVERRIDE {
    settings->layer_transforms_should_scale_layer_contents = true;
  }

  virtual void SetupTree() OVERRIDE {
    root_layer_ = Layer::Create();
    root_layer_->SetBounds(gfx::Size(10, 20));

    bool paint_scrollbar = true;
    bool has_thumb = false;
    scrollbar_ = FakeScrollbarLayer::Create(paint_scrollbar,
                                            has_thumb,
                                            root_layer_->id());
    scrollbar_->SetPosition(gfx::Point(0, 10));
    scrollbar_->SetBounds(gfx::Size(10, 10));

    root_layer_->AddChild(scrollbar_);

    layer_tree_host()->SetRootLayer(root_layer_);
    LayerTreeHostTest::SetupTree();
  }

  virtual void BeginTest() OVERRIDE {
    PostSetNeedsCommitToMainThread();
  }

  virtual void DrawLayersOnThread(LayerTreeHostImpl* host_impl) OVERRIDE {
    if (host_impl->active_tree()->source_frame_number() == 1)
      EndTest();
  }

  virtual void DidCommit() OVERRIDE {
    switch (layer_tree_host()->commit_number()) {
      case 1:
        // Changing the device scale factor causes a commit. It also changes
        // the content bounds of |scrollbar_|, which should not generate
        // a second commit as a result.
        layer_tree_host()->SetDeviceScaleFactor(4.f);
        break;
      default:
        // No extra commits.
        EXPECT_EQ(2, layer_tree_host()->commit_number());
    }
  }

  virtual void AfterTest() OVERRIDE {
    EXPECT_EQ(gfx::Size(40, 40).ToString(),
              scrollbar_->content_bounds().ToString());
  }

 private:
  FakeContentLayerClient client_;
  scoped_refptr<Layer> root_layer_;
  scoped_refptr<FakeScrollbarLayer> scrollbar_;
};

SINGLE_AND_MULTI_THREAD_TEST_F(
    LayerTreeHostTestNoExtraCommitFromScrollbarInvalidate);

class LayerTreeHostTestCompositeAndReadback : public LayerTreeHostTest {
 public:
  LayerTreeHostTestCompositeAndReadback() : num_commits_(0) {}

  virtual void BeginTest() OVERRIDE { PostSetNeedsCommitToMainThread(); }

  virtual void DidCommit() OVERRIDE {
    num_commits_++;
    if (num_commits_ == 1) {
      char pixels[4];
      layer_tree_host()->CompositeAndReadback(&pixels, gfx::Rect(0, 0, 1, 1));
    } else if (num_commits_ == 2) {
      // This is inside the readback. We should get another commit after it.
    } else if (num_commits_ == 3) {
      EndTest();
    } else {
      NOTREACHED();
    }
  }

  virtual void AfterTest() OVERRIDE {}

 private:
  int num_commits_;
};

MULTI_THREAD_TEST_F(LayerTreeHostTestCompositeAndReadback);

class LayerTreeHostTestCompositeAndReadbackBeforePreviousCommitDraws
    : public LayerTreeHostTest {
 public:
  LayerTreeHostTestCompositeAndReadbackBeforePreviousCommitDraws()
      : num_commits_(0) {}

  virtual void BeginTest() OVERRIDE { PostSetNeedsCommitToMainThread(); }

  virtual void DidCommit() OVERRIDE {
    num_commits_++;
    if (num_commits_ == 1) {
      layer_tree_host()->SetNeedsCommit();
    } else if (num_commits_ == 2) {
      char pixels[4];
      layer_tree_host()->CompositeAndReadback(&pixels, gfx::Rect(0, 0, 1, 1));
    } else if (num_commits_ == 3) {
      // This is inside the readback. We should get another commit after it.
    } else if (num_commits_ == 4) {
      EndTest();
    } else {
      NOTREACHED();
    }
  }

  virtual void AfterTest() OVERRIDE {}

 private:
  int num_commits_;
};

MULTI_THREAD_TEST_F(
    LayerTreeHostTestCompositeAndReadbackBeforePreviousCommitDraws);

// If the layerTreeHost says it can't draw, Then we should not try to draw.
class LayerTreeHostTestCanDrawBlocksDrawing : public LayerTreeHostTest {
 public:
  LayerTreeHostTestCanDrawBlocksDrawing() : num_commits_(0), done_(false) {}

  virtual void BeginTest() OVERRIDE { PostSetNeedsCommitToMainThread(); }

  virtual void DrawLayersOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    if (done_)
      return;
    // Only the initial draw should bring us here.
    EXPECT_TRUE(impl->CanDraw());
    EXPECT_EQ(0, impl->active_tree()->source_frame_number());
  }

  virtual void CommitCompleteOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    if (done_)
      return;
    if (num_commits_ >= 1) {
      // After the first commit, we should not be able to draw.
      EXPECT_FALSE(impl->CanDraw());
    }
  }

  virtual void DidCommit() OVERRIDE {
    num_commits_++;
    if (num_commits_ == 1) {
      // Make the viewport empty so the host says it can't draw.
      layer_tree_host()->SetViewportSize(gfx::Size(0, 0));
    } else if (num_commits_ == 2) {
      char pixels[4];
      layer_tree_host()->CompositeAndReadback(&pixels, gfx::Rect(0, 0, 1, 1));
    } else if (num_commits_ == 3) {
      // Let it draw so we go idle and end the test.
      layer_tree_host()->SetViewportSize(gfx::Size(1, 1));
      done_ = true;
      EndTest();
    }
  }

  virtual void AfterTest() OVERRIDE {}

 private:
  int num_commits_;
  bool done_;
};

SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostTestCanDrawBlocksDrawing);

// beginLayerWrite should prevent draws from executing until a commit occurs
class LayerTreeHostTestWriteLayersRedraw : public LayerTreeHostTest {
 public:
  LayerTreeHostTestWriteLayersRedraw() : num_commits_(0), num_draws_(0) {}

  virtual void BeginTest() OVERRIDE {
    PostAcquireLayerTextures();
    PostSetNeedsRedrawToMainThread();  // should be inhibited without blocking
    PostSetNeedsCommitToMainThread();
  }

  virtual void DrawLayersOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    num_draws_++;
    EXPECT_EQ(num_draws_, num_commits_);
  }

  virtual void CommitCompleteOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    num_commits_++;
    EndTest();
  }

  virtual void AfterTest() OVERRIDE { EXPECT_EQ(1, num_commits_); }

 private:
  int num_commits_;
  int num_draws_;
};

MULTI_THREAD_TEST_F(LayerTreeHostTestWriteLayersRedraw);

// Verify that when resuming visibility, Requesting layer write permission
// will not deadlock the main thread even though there are not yet any
// scheduled redraws. This behavior is critical for reliably surviving tab
// switching. There are no failure conditions to this test, it just passes
// by not timing out.
class LayerTreeHostTestWriteLayersAfterVisible : public LayerTreeHostTest {
 public:
  LayerTreeHostTestWriteLayersAfterVisible() : num_commits_(0) {}

  virtual void BeginTest() OVERRIDE { PostSetNeedsCommitToMainThread(); }

  virtual void CommitCompleteOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    num_commits_++;
    if (num_commits_ == 2)
      EndTest();
    else if (num_commits_ < 2) {
      PostSetVisibleToMainThread(false);
      PostSetVisibleToMainThread(true);
      PostAcquireLayerTextures();
      PostSetNeedsCommitToMainThread();
    }
  }

  virtual void AfterTest() OVERRIDE {}

 private:
  int num_commits_;
};

MULTI_THREAD_TEST_F(LayerTreeHostTestWriteLayersAfterVisible);

// A compositeAndReadback while invisible should force a normal commit without
// assertion.
class LayerTreeHostTestCompositeAndReadbackWhileInvisible
    : public LayerTreeHostTest {
 public:
  LayerTreeHostTestCompositeAndReadbackWhileInvisible() : num_commits_(0) {}

  virtual void BeginTest() OVERRIDE { PostSetNeedsCommitToMainThread(); }

  virtual void DidCommitAndDrawFrame() OVERRIDE {
    num_commits_++;
    if (num_commits_ == 1) {
      layer_tree_host()->SetVisible(false);
      layer_tree_host()->SetNeedsCommit();
      layer_tree_host()->SetNeedsCommit();
      char pixels[4];
      layer_tree_host()->CompositeAndReadback(&pixels, gfx::Rect(0, 0, 1, 1));
    } else {
      EndTest();
    }
  }

  virtual void AfterTest() OVERRIDE {}

 private:
  int num_commits_;
};

MULTI_THREAD_TEST_F(LayerTreeHostTestCompositeAndReadbackWhileInvisible);

class LayerTreeHostTestAbortFrameWhenInvisible : public LayerTreeHostTest {
 public:
  LayerTreeHostTestAbortFrameWhenInvisible() {}

  virtual void BeginTest() OVERRIDE {
    // Request a commit (from the main thread), Which will trigger the commit
    // flow from the impl side.
    layer_tree_host()->SetNeedsCommit();
    // Then mark ourselves as not visible before processing any more messages
    // on the main thread.
    layer_tree_host()->SetVisible(false);
    // If we make it without kicking a frame, we pass!
    EndTestAfterDelay(1);
  }

  virtual void Layout() OVERRIDE {
    ASSERT_FALSE(true);
    EndTest();
  }

  virtual void AfterTest() OVERRIDE {}

 private:
};

MULTI_THREAD_TEST_F(LayerTreeHostTestAbortFrameWhenInvisible);

// This test verifies that properties on the layer tree host are commited
// to the impl side.
class LayerTreeHostTestCommit : public LayerTreeHostTest {
 public:
  LayerTreeHostTestCommit() {}

  virtual void BeginTest() OVERRIDE {
    layer_tree_host()->SetViewportSize(gfx::Size(20, 20));
    layer_tree_host()->set_background_color(SK_ColorGRAY);
    layer_tree_host()->SetPageScaleFactorAndLimits(5.f, 5.f, 5.f);

    PostSetNeedsCommitToMainThread();
  }

  virtual void DidActivateTreeOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    EXPECT_EQ(gfx::Size(20, 20), impl->device_viewport_size());
    EXPECT_EQ(SK_ColorGRAY, impl->active_tree()->background_color());
    EXPECT_EQ(5.f, impl->active_tree()->page_scale_factor());

    EndTest();
  }

  virtual void AfterTest() OVERRIDE {}
};

MULTI_THREAD_TEST_F(LayerTreeHostTestCommit);

// This test verifies that LayerTreeHostImpl's current frame time gets
// updated in consecutive frames when it doesn't draw due to tree
// activation failure.
class LayerTreeHostTestFrameTimeUpdatesAfterActivationFails
    : public LayerTreeHostTest {
 public:
  LayerTreeHostTestFrameTimeUpdatesAfterActivationFails() : frame_(0) {}

  virtual void BeginTest() OVERRIDE {
    layer_tree_host()->SetViewportSize(gfx::Size(20, 20));
    layer_tree_host()->set_background_color(SK_ColorGRAY);

    PostSetNeedsCommitToMainThread();
  }

  virtual void DrawLayersOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    if (frame_ >= 1) {
      EXPECT_NE(first_frame_time_, impl->CurrentFrameTimeTicks());
      EndTest();
      return;
    }

    EXPECT_FALSE(impl->settings().impl_side_painting);
    EndTest();
  }

  virtual bool CanActivatePendingTree(LayerTreeHostImpl* impl) OVERRIDE {
    if (frame_ >= 1)
      return true;

    return false;
  }

  virtual bool CanActivatePendingTreeIfNeeded(LayerTreeHostImpl* impl)
      OVERRIDE {
    frame_++;
    if (frame_ == 1) {
      first_frame_time_ = impl->CurrentFrameTimeTicks();

      // Since base::TimeTicks::Now() uses a low-resolution clock on
      // Windows, we need to make sure that the clock has incremented past
      // first_frame_time_.
      while (first_frame_time_ == base::TimeTicks::Now()) {}

      return false;
    }

    return true;
  }

  virtual void AfterTest() OVERRIDE {}

 private:
  int frame_;
  base::TimeTicks first_frame_time_;
};

SINGLE_AND_MULTI_THREAD_TEST_F(
    LayerTreeHostTestFrameTimeUpdatesAfterActivationFails);

// This test verifies that LayerTreeHostImpl's current frame time gets
// updated in consecutive frames when it draws in each frame.
class LayerTreeHostTestFrameTimeUpdatesAfterDraw : public LayerTreeHostTest {
 public:
  LayerTreeHostTestFrameTimeUpdatesAfterDraw() : frame_(0) {}

  virtual void BeginTest() OVERRIDE {
    layer_tree_host()->SetViewportSize(gfx::Size(20, 20));
    layer_tree_host()->set_background_color(SK_ColorGRAY);

    PostSetNeedsCommitToMainThread();
  }

  virtual void DrawLayersOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    frame_++;
    if (frame_ == 1) {
      first_frame_time_ = impl->CurrentFrameTimeTicks();
      impl->SetNeedsRedraw();

      // Since base::TimeTicks::Now() uses a low-resolution clock on
      // Windows, we need to make sure that the clock has incremented past
      // first_frame_time_.
      while (first_frame_time_ == base::TimeTicks::Now()) {}

      return;
    }

    EXPECT_NE(first_frame_time_, impl->CurrentFrameTimeTicks());
    EndTest();
  }

  virtual void CommitCompleteOnThread(LayerTreeHostImpl* host_impl) OVERRIDE {
    // Ensure there isn't a commit between the two draws, to ensure that a
    // commit isn't required for updating the current frame time. We can
    // only check for this in the multi-threaded case, since in the single-
    // threaded case there will always be a commit between consecutive draws.
    if (HasImplThread())
      EXPECT_EQ(0, frame_);
  }

  virtual void AfterTest() OVERRIDE {}

 private:
  int frame_;
  base::TimeTicks first_frame_time_;
};

SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostTestFrameTimeUpdatesAfterDraw);

// Verifies that StartPageScaleAnimation events propagate correctly
// from LayerTreeHost to LayerTreeHostImpl in the MT compositor.
class LayerTreeHostTestStartPageScaleAnimation : public LayerTreeHostTest {
 public:
  LayerTreeHostTestStartPageScaleAnimation() {}

  virtual void SetupTree() OVERRIDE {
    LayerTreeHostTest::SetupTree();

    scroll_layer_ = FakeContentLayer::Create(&client_);
    scroll_layer_->SetScrollable(true);
    scroll_layer_->SetScrollOffset(gfx::Vector2d());
    layer_tree_host()->root_layer()->AddChild(scroll_layer_);
  }

  virtual void BeginTest() OVERRIDE {
    PostSetNeedsCommitToMainThread();
  }

  virtual void ApplyScrollAndScale(gfx::Vector2d scroll_delta, float scale)
      OVERRIDE {
    gfx::Vector2d offset = scroll_layer_->scroll_offset();
    scroll_layer_->SetScrollOffset(offset + scroll_delta);
    layer_tree_host()->SetPageScaleFactorAndLimits(scale, 0.5f, 2.f);
  }

  virtual void DidActivateTreeOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    impl->ProcessScrollDeltas();
    // We get one commit before the first draw, and the animation doesn't happen
    // until the second draw.
    switch (impl->active_tree()->source_frame_number()) {
      case 0:
        EXPECT_EQ(1.f, impl->active_tree()->page_scale_factor());
        // We'll start an animation when we get back to the main thread.
        break;
      case 1:
        EXPECT_EQ(1.f, impl->active_tree()->page_scale_factor());
        PostSetNeedsRedrawToMainThread();
        break;
      case 2:
        EXPECT_EQ(1.25f, impl->active_tree()->page_scale_factor());
        EndTest();
        break;
      default:
        NOTREACHED();
    }
  }

  virtual void DidCommitAndDrawFrame() OVERRIDE {
    switch (layer_tree_host()->commit_number()) {
      case 1:
        layer_tree_host()->SetPageScaleFactorAndLimits(1.f, 0.5f, 2.f);
        layer_tree_host()->StartPageScaleAnimation(
            gfx::Vector2d(), false, 1.25f, base::TimeDelta());
        break;
    }
  }

  virtual void AfterTest() OVERRIDE {}

  FakeContentLayerClient client_;
  scoped_refptr<FakeContentLayer> scroll_layer_;
};

MULTI_THREAD_TEST_F(LayerTreeHostTestStartPageScaleAnimation);

class LayerTreeHostTestSetVisible : public LayerTreeHostTest {
 public:
  LayerTreeHostTestSetVisible() : num_draws_(0) {}

  virtual void BeginTest() OVERRIDE {
    PostSetNeedsCommitToMainThread();
    PostSetVisibleToMainThread(false);
    // This is suppressed while we're invisible.
    PostSetNeedsRedrawToMainThread();
    // Triggers the redraw.
    PostSetVisibleToMainThread(true);
  }

  virtual void DrawLayersOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    EXPECT_TRUE(impl->visible());
    ++num_draws_;
    EndTest();
  }

  virtual void AfterTest() OVERRIDE { EXPECT_EQ(1, num_draws_); }

 private:
  int num_draws_;
};

MULTI_THREAD_TEST_F(LayerTreeHostTestSetVisible);

class TestOpacityChangeLayerDelegate : public ContentLayerClient {
 public:
  TestOpacityChangeLayerDelegate() : test_layer_(0) {}

  void SetTestLayer(Layer* test_layer) { test_layer_ = test_layer; }

  virtual void PaintContents(SkCanvas*, gfx::Rect, gfx::RectF*) OVERRIDE {
    // Set layer opacity to 0.
    if (test_layer_)
      test_layer_->SetOpacity(0.f);
  }
  virtual void DidChangeLayerCanUseLCDText() OVERRIDE {}

 private:
  Layer* test_layer_;
};

class ContentLayerWithUpdateTracking : public ContentLayer {
 public:
  static scoped_refptr<ContentLayerWithUpdateTracking> Create(
      ContentLayerClient* client) {
    return make_scoped_refptr(new ContentLayerWithUpdateTracking(client));
  }

  int PaintContentsCount() { return paint_contents_count_; }
  void ResetPaintContentsCount() { paint_contents_count_ = 0; }

  virtual bool Update(ResourceUpdateQueue* queue,
                      const OcclusionTracker* occlusion) OVERRIDE {
    bool updated = ContentLayer::Update(queue, occlusion);
    paint_contents_count_++;
    return updated;
  }

 private:
  explicit ContentLayerWithUpdateTracking(ContentLayerClient* client)
      : ContentLayer(client), paint_contents_count_(0) {
    SetAnchorPoint(gfx::PointF(0.f, 0.f));
    SetBounds(gfx::Size(10, 10));
    SetIsDrawable(true);
  }
  virtual ~ContentLayerWithUpdateTracking() {}

  int paint_contents_count_;
};

// Layer opacity change during paint should not prevent compositor resources
// from being updated during commit.
class LayerTreeHostTestOpacityChange : public LayerTreeHostTest {
 public:
  LayerTreeHostTestOpacityChange()
      : test_opacity_change_delegate_(),
        update_check_layer_(ContentLayerWithUpdateTracking::Create(
            &test_opacity_change_delegate_)) {
    test_opacity_change_delegate_.SetTestLayer(update_check_layer_.get());
  }

  virtual void BeginTest() OVERRIDE {
    layer_tree_host()->SetViewportSize(gfx::Size(10, 10));
    layer_tree_host()->root_layer()->AddChild(update_check_layer_);

    PostSetNeedsCommitToMainThread();
  }

  virtual void CommitCompleteOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    EndTest();
  }

  virtual void AfterTest() OVERRIDE {
    // Update() should have been called once.
    EXPECT_EQ(1, update_check_layer_->PaintContentsCount());
  }

 private:
  TestOpacityChangeLayerDelegate test_opacity_change_delegate_;
  scoped_refptr<ContentLayerWithUpdateTracking> update_check_layer_;
};

MULTI_THREAD_TEST_F(LayerTreeHostTestOpacityChange);

class NoScaleContentLayer : public ContentLayer {
 public:
  static scoped_refptr<NoScaleContentLayer> Create(ContentLayerClient* client) {
    return make_scoped_refptr(new NoScaleContentLayer(client));
  }

  virtual void CalculateContentsScale(float ideal_contents_scale,
                                      float device_scale_factor,
                                      float page_scale_factor,
                                      bool animating_transform_to_screen,
                                      float* contents_scale_x,
                                      float* contents_scale_y,
                                      gfx::Size* contentBounds) OVERRIDE {
    // Skip over the ContentLayer's method to the base Layer class.
    Layer::CalculateContentsScale(ideal_contents_scale,
                                  device_scale_factor,
                                  page_scale_factor,
                                  animating_transform_to_screen,
                                  contents_scale_x,
                                  contents_scale_y,
                                  contentBounds);
  }

 private:
  explicit NoScaleContentLayer(ContentLayerClient* client)
      : ContentLayer(client) {}
  virtual ~NoScaleContentLayer() {}
};

class LayerTreeHostTestDeviceScaleFactorScalesViewportAndLayers
    : public LayerTreeHostTest {
 public:
  LayerTreeHostTestDeviceScaleFactorScalesViewportAndLayers()
      : root_layer_(NoScaleContentLayer::Create(&client_)),
        child_layer_(ContentLayer::Create(&client_)) {}

  virtual void BeginTest() OVERRIDE {
    layer_tree_host()->SetViewportSize(gfx::Size(60, 60));
    layer_tree_host()->SetDeviceScaleFactor(1.5);
    EXPECT_EQ(gfx::Size(60, 60), layer_tree_host()->device_viewport_size());

    root_layer_->AddChild(child_layer_);

    root_layer_->SetIsDrawable(true);
    root_layer_->SetBounds(gfx::Size(30, 30));
    root_layer_->SetAnchorPoint(gfx::PointF(0.f, 0.f));

    child_layer_->SetIsDrawable(true);
    child_layer_->SetPosition(gfx::Point(2, 2));
    child_layer_->SetBounds(gfx::Size(10, 10));
    child_layer_->SetAnchorPoint(gfx::PointF(0.f, 0.f));

    layer_tree_host()->SetRootLayer(root_layer_);

    PostSetNeedsCommitToMainThread();
  }

  virtual void DidActivateTreeOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    // Should only do one commit.
    EXPECT_EQ(0, impl->active_tree()->source_frame_number());
    // Device scale factor should come over to impl.
    EXPECT_NEAR(impl->device_scale_factor(), 1.5f, 0.00001f);

    // Both layers are on impl.
    ASSERT_EQ(1u, impl->active_tree()->root_layer()->children().size());

    // Device viewport is scaled.
    EXPECT_EQ(gfx::Size(60, 60), impl->device_viewport_size());

    LayerImpl* root = impl->active_tree()->root_layer();
    LayerImpl* child = impl->active_tree()->root_layer()->children()[0];

    // Positions remain in layout pixels.
    EXPECT_EQ(gfx::Point(0, 0), root->position());
    EXPECT_EQ(gfx::Point(2, 2), child->position());

    // Compute all the layer transforms for the frame.
    LayerTreeHostImpl::FrameData frame_data;
    impl->PrepareToDraw(&frame_data, gfx::Rect());
    impl->DidDrawAllLayers(frame_data);

    const LayerImplList& render_surface_layer_list =
        *frame_data.render_surface_layer_list;

    // Both layers should be drawing into the root render surface.
    ASSERT_EQ(1u, render_surface_layer_list.size());
    ASSERT_EQ(root->render_surface(),
              render_surface_layer_list[0]->render_surface());
    ASSERT_EQ(2u, root->render_surface()->layer_list().size());

    // The root render surface is the size of the viewport.
    EXPECT_RECT_EQ(gfx::Rect(0, 0, 60, 60),
                   root->render_surface()->content_rect());

    // The content bounds of the child should be scaled.
    gfx::Size child_bounds_scaled =
        gfx::ToCeiledSize(gfx::ScaleSize(child->bounds(), 1.5));
    EXPECT_EQ(child_bounds_scaled, child->content_bounds());

    gfx::Transform scale_transform;
    scale_transform.Scale(impl->device_scale_factor(),
                          impl->device_scale_factor());

    // The root layer is scaled by 2x.
    gfx::Transform root_screen_space_transform = scale_transform;
    gfx::Transform root_draw_transform = scale_transform;

    EXPECT_EQ(root_draw_transform, root->draw_transform());
    EXPECT_EQ(root_screen_space_transform, root->screen_space_transform());

    // The child is at position 2,2, which is transformed to 3,3 after the scale
    gfx::Transform child_screen_space_transform;
    child_screen_space_transform.Translate(3.f, 3.f);
    gfx::Transform child_draw_transform = child_screen_space_transform;

    EXPECT_TRANSFORMATION_MATRIX_EQ(child_draw_transform,
                                    child->draw_transform());
    EXPECT_TRANSFORMATION_MATRIX_EQ(child_screen_space_transform,
                                    child->screen_space_transform());

    EndTest();
  }

  virtual void AfterTest() OVERRIDE {}

 private:
  FakeContentLayerClient client_;
  scoped_refptr<NoScaleContentLayer> root_layer_;
  scoped_refptr<ContentLayer> child_layer_;
};

MULTI_THREAD_TEST_F(LayerTreeHostTestDeviceScaleFactorScalesViewportAndLayers);

// Verify atomicity of commits and reuse of textures.
class LayerTreeHostTestAtomicCommit : public LayerTreeHostTest {
 public:
  virtual void InitializeSettings(LayerTreeSettings* settings) OVERRIDE {
    // Make sure partial texture updates are turned off.
    settings->max_partial_texture_updates = 0;
    // Linear fade animator prevents scrollbars from drawing immediately.
    settings->use_linear_fade_scrollbar_animator = false;
  }

  virtual void SetupTree() OVERRIDE {
    layer_ = FakeContentLayer::Create(&client_);
    layer_->SetBounds(gfx::Size(10, 20));

    bool paint_scrollbar = true;
    bool has_thumb = false;
    scrollbar_ =
        FakeScrollbarLayer::Create(paint_scrollbar, has_thumb, layer_->id());
    scrollbar_->SetPosition(gfx::Point(0, 10));
    scrollbar_->SetBounds(gfx::Size(10, 10));

    layer_->AddChild(scrollbar_);

    layer_tree_host()->SetRootLayer(layer_);
    LayerTreeHostTest::SetupTree();
  }

  virtual void BeginTest() OVERRIDE {
    drew_frame_ = -1;
    PostSetNeedsCommitToMainThread();
  }

  virtual void DidActivateTreeOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    ASSERT_EQ(0u, layer_tree_host()->settings().max_partial_texture_updates);

    TestWebGraphicsContext3D* context = static_cast<TestWebGraphicsContext3D*>(
        impl->output_surface()->context3d());

    switch (impl->active_tree()->source_frame_number()) {
      case 0:
        // Number of textures should be one for each layer
        ASSERT_EQ(2u, context->NumTextures());
        // Number of textures used for commit should be one for each layer.
        EXPECT_EQ(2u, context->NumUsedTextures());
        // Verify that used texture is correct.
        EXPECT_TRUE(context->UsedTexture(context->TextureAt(0)));
        EXPECT_TRUE(context->UsedTexture(context->TextureAt(1)));

        context->ResetUsedTextures();
        PostSetNeedsCommitToMainThread();
        break;
      case 1:
        // Number of textures should be doubled as the first textures
        // are used by impl thread and cannot by used for update.
        ASSERT_EQ(4u, context->NumTextures());
        // Number of textures used for commit should still be
        // one for each layer.
        EXPECT_EQ(2u, context->NumUsedTextures());
        // First textures should not have been used.
        EXPECT_FALSE(context->UsedTexture(context->TextureAt(0)));
        EXPECT_FALSE(context->UsedTexture(context->TextureAt(1)));
        // New textures should have been used.
        EXPECT_TRUE(context->UsedTexture(context->TextureAt(2)));
        EXPECT_TRUE(context->UsedTexture(context->TextureAt(3)));

        context->ResetUsedTextures();
        PostSetNeedsCommitToMainThread();
        break;
      case 2:
        EndTest();
        break;
      default:
        NOTREACHED();
        break;
    }
  }

  virtual void DrawLayersOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    TestWebGraphicsContext3D* context = static_cast<TestWebGraphicsContext3D*>(
        impl->output_surface()->context3d());

    if (drew_frame_ == impl->active_tree()->source_frame_number()) {
      EXPECT_EQ(0u, context->NumUsedTextures()) << "For frame " << drew_frame_;
      return;
    }
    drew_frame_ = impl->active_tree()->source_frame_number();

    // We draw/ship one texture each frame for each layer.
    EXPECT_EQ(2u, context->NumUsedTextures());
    context->ResetUsedTextures();
  }

  virtual void Layout() OVERRIDE {
    layer_->SetNeedsDisplay();
    scrollbar_->SetNeedsDisplay();
  }

  virtual void AfterTest() OVERRIDE {}

 private:
  FakeContentLayerClient client_;
  scoped_refptr<FakeContentLayer> layer_;
  scoped_refptr<FakeScrollbarLayer> scrollbar_;
  int drew_frame_;
};

MULTI_THREAD_TEST_F(LayerTreeHostTestAtomicCommit);

static void SetLayerPropertiesForTesting(Layer* layer,
                                         Layer* parent,
                                         const gfx::Transform& transform,
                                         gfx::PointF anchor,
                                         gfx::PointF position,
                                         gfx::Size bounds,
                                         bool opaque) {
  layer->RemoveAllChildren();
  if (parent)
    parent->AddChild(layer);
  layer->SetTransform(transform);
  layer->SetAnchorPoint(anchor);
  layer->SetPosition(position);
  layer->SetBounds(bounds);
  layer->SetContentsOpaque(opaque);
}

class LayerTreeHostTestAtomicCommitWithPartialUpdate
    : public LayerTreeHostTest {
 public:
  virtual void InitializeSettings(LayerTreeSettings* settings) OVERRIDE {
    // Allow one partial texture update.
    settings->max_partial_texture_updates = 1;
    // Linear fade animator prevents scrollbars from drawing immediately.
    settings->use_linear_fade_scrollbar_animator = false;
    // No partial updates when impl side painting is enabled.
    settings->impl_side_painting = false;
  }

  virtual void SetupTree() OVERRIDE {
    parent_ = FakeContentLayer::Create(&client_);
    parent_->SetBounds(gfx::Size(10, 20));

    child_ = FakeContentLayer::Create(&client_);
    child_->SetPosition(gfx::Point(0, 10));
    child_->SetBounds(gfx::Size(3, 10));

    bool paint_scrollbar = true;
    bool has_thumb = false;
    scrollbar_with_paints_ =
        FakeScrollbarLayer::Create(paint_scrollbar, has_thumb, parent_->id());
    scrollbar_with_paints_->SetPosition(gfx::Point(3, 10));
    scrollbar_with_paints_->SetBounds(gfx::Size(3, 10));

    paint_scrollbar = false;
    scrollbar_without_paints_ =
        FakeScrollbarLayer::Create(paint_scrollbar, has_thumb, parent_->id());
    scrollbar_without_paints_->SetPosition(gfx::Point(6, 10));
    scrollbar_without_paints_->SetBounds(gfx::Size(3, 10));

    parent_->AddChild(child_);
    parent_->AddChild(scrollbar_with_paints_);
    parent_->AddChild(scrollbar_without_paints_);

    layer_tree_host()->SetRootLayer(parent_);
    LayerTreeHostTest::SetupTree();
  }

  virtual void BeginTest() OVERRIDE {
    PostSetNeedsCommitToMainThread();
  }

  virtual void DidCommitAndDrawFrame() OVERRIDE {
    switch (layer_tree_host()->commit_number()) {
      case 1:
        parent_->SetNeedsDisplay();
        child_->SetNeedsDisplay();
        scrollbar_with_paints_->SetNeedsDisplay();
        scrollbar_without_paints_->SetNeedsDisplay();
        break;
      case 2:
        // Damage part of layers.
        parent_->SetNeedsDisplayRect(gfx::RectF(0.f, 0.f, 5.f, 5.f));
        child_->SetNeedsDisplayRect(gfx::RectF(0.f, 0.f, 5.f, 5.f));
        scrollbar_with_paints_->SetNeedsDisplayRect(
            gfx::RectF(0.f, 0.f, 5.f, 5.f));
        scrollbar_without_paints_->SetNeedsDisplayRect(
            gfx::RectF(0.f, 0.f, 5.f, 5.f));
        break;
      case 3:
        child_->SetNeedsDisplay();
        scrollbar_with_paints_->SetNeedsDisplay();
        scrollbar_without_paints_->SetNeedsDisplay();
        layer_tree_host()->SetViewportSize(gfx::Size(10, 10));
        break;
      case 4:
        layer_tree_host()->SetViewportSize(gfx::Size(10, 20));
        break;
      case 5:
        EndTest();
        break;
      default:
        NOTREACHED() << layer_tree_host()->commit_number();
        break;
    }
  }

  virtual void CommitCompleteOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    ASSERT_EQ(1u, layer_tree_host()->settings().max_partial_texture_updates);

    TestWebGraphicsContext3D* context = static_cast<TestWebGraphicsContext3D*>(
        impl->output_surface()->context3d());

    switch (impl->active_tree()->source_frame_number()) {
      case 0:
        // Number of textures should be one for each layer.
        ASSERT_EQ(4u, context->NumTextures());
        // Number of textures used for commit should be one for each layer.
        EXPECT_EQ(4u, context->NumUsedTextures());
        // Verify that used textures are correct.
        EXPECT_TRUE(context->UsedTexture(context->TextureAt(0)));
        EXPECT_TRUE(context->UsedTexture(context->TextureAt(1)));
        EXPECT_TRUE(context->UsedTexture(context->TextureAt(2)));
        EXPECT_TRUE(context->UsedTexture(context->TextureAt(3)));

        context->ResetUsedTextures();
        break;
      case 1:
        // Number of textures should be two for each content layer and one
        // for each scrollbar, since they always do a partial update.
        ASSERT_EQ(6u, context->NumTextures());
        // Number of textures used for commit should be one for each content
        // layer, and one for the scrollbar layer that paints.
        EXPECT_EQ(3u, context->NumUsedTextures());

        // First content textures should not have been used.
        EXPECT_FALSE(context->UsedTexture(context->TextureAt(0)));
        EXPECT_FALSE(context->UsedTexture(context->TextureAt(1)));
        // The non-painting scrollbar's texture wasn't updated.
        EXPECT_FALSE(context->UsedTexture(context->TextureAt(2)));
        // The painting scrollbar's partial update texture was used.
        EXPECT_TRUE(context->UsedTexture(context->TextureAt(3)));
        // New textures should have been used.
        EXPECT_TRUE(context->UsedTexture(context->TextureAt(4)));
        EXPECT_TRUE(context->UsedTexture(context->TextureAt(5)));

        context->ResetUsedTextures();
        break;
      case 2:
        // Number of textures should be two for each content layer and one
        // for each scrollbar, since they always do a partial update.
        ASSERT_EQ(6u, context->NumTextures());
        // Number of textures used for commit should be one for each content
        // layer, and one for the scrollbar layer that paints.
        EXPECT_EQ(3u, context->NumUsedTextures());

        // The non-painting scrollbar's texture wasn't updated.
        EXPECT_FALSE(context->UsedTexture(context->TextureAt(2)));
        // The painting scrollbar does a partial update.
        EXPECT_TRUE(context->UsedTexture(context->TextureAt(3)));
        // One content layer does a partial update also.
        EXPECT_TRUE(context->UsedTexture(context->TextureAt(4)));
        EXPECT_FALSE(context->UsedTexture(context->TextureAt(5)));

        context->ResetUsedTextures();
        break;
      case 3:
        // No textures should be used for commit.
        EXPECT_EQ(0u, context->NumUsedTextures());

        context->ResetUsedTextures();
        break;
      case 4:
        // Number of textures used for commit should be two. One for the
        // content layer, and one for the painting scrollbar. The
        // non-painting scrollbar doesn't update its texture.
        EXPECT_EQ(2u, context->NumUsedTextures());

        context->ResetUsedTextures();
        break;
      default:
        NOTREACHED();
        break;
    }
  }

  virtual void DrawLayersOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    EXPECT_LT(impl->active_tree()->source_frame_number(), 5);

    TestWebGraphicsContext3D* context = static_cast<TestWebGraphicsContext3D*>(
        impl->output_surface()->context3d());

    // Number of textures used for drawing should one per layer except for
    // frame 3 where the viewport only contains one layer.
    if (impl->active_tree()->source_frame_number() == 3) {
      EXPECT_EQ(1u, context->NumUsedTextures());
    } else {
      EXPECT_EQ(4u, context->NumUsedTextures()) <<
          "For frame " << impl->active_tree()->source_frame_number();
    }

    context->ResetUsedTextures();
  }

  virtual void AfterTest() OVERRIDE {}

 private:
  FakeContentLayerClient client_;
  scoped_refptr<FakeContentLayer> parent_;
  scoped_refptr<FakeContentLayer> child_;
  scoped_refptr<FakeScrollbarLayer> scrollbar_with_paints_;
  scoped_refptr<FakeScrollbarLayer> scrollbar_without_paints_;
};

// Partial updates are not possible with a delegating renderer.
SINGLE_AND_MULTI_THREAD_DIRECT_RENDERER_TEST_F(
    LayerTreeHostTestAtomicCommitWithPartialUpdate);

class LayerTreeHostTestFinishAllRendering : public LayerTreeHostTest {
 public:
  LayerTreeHostTestFinishAllRendering() : once_(false), draw_count_(0) {}

  virtual void BeginTest() OVERRIDE {
    layer_tree_host()->SetNeedsRedraw();
    PostSetNeedsCommitToMainThread();
  }

  virtual void DidCommitAndDrawFrame() OVERRIDE {
    if (once_)
      return;
    once_ = true;
    layer_tree_host()->SetNeedsRedraw();
    layer_tree_host()->AcquireLayerTextures();
    {
      base::AutoLock lock(lock_);
      draw_count_ = 0;
    }
    layer_tree_host()->FinishAllRendering();
    {
      base::AutoLock lock(lock_);
      EXPECT_EQ(0, draw_count_);
    }
    EndTest();
  }

  virtual void DrawLayersOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    base::AutoLock lock(lock_);
    ++draw_count_;
  }

  virtual void AfterTest() OVERRIDE {}

 private:
  bool once_;
  base::Lock lock_;
  int draw_count_;
};

SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostTestFinishAllRendering);

class LayerTreeHostTestCompositeAndReadbackCleanup : public LayerTreeHostTest {
 public:
  virtual void BeginTest() OVERRIDE {
    Layer* root_layer = layer_tree_host()->root_layer();

    char pixels[4];
    layer_tree_host()->CompositeAndReadback(static_cast<void*>(&pixels),
                                            gfx::Rect(0, 0, 1, 1));
    EXPECT_FALSE(root_layer->render_surface());

    EndTest();
  }

  virtual void AfterTest() OVERRIDE {}
};

SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostTestCompositeAndReadbackCleanup);

class LayerTreeHostTestSurfaceNotAllocatedForLayersOutsideMemoryLimit
    : public LayerTreeHostTest {
 protected:
  virtual void InitializeSettings(LayerTreeSettings* settings) OVERRIDE {
    settings->cache_render_pass_contents = true;
  }

  virtual void SetupTree() OVERRIDE {
    root_layer_ = FakeContentLayer::Create(&client_);
    root_layer_->SetBounds(gfx::Size(100, 100));

    surface_layer1_ = FakeContentLayer::Create(&client_);
    surface_layer1_->SetBounds(gfx::Size(100, 100));
    surface_layer1_->SetForceRenderSurface(true);
    surface_layer1_->SetOpacity(0.5f);
    root_layer_->AddChild(surface_layer1_);

    surface_layer2_ = FakeContentLayer::Create(&client_);
    surface_layer2_->SetBounds(gfx::Size(100, 100));
    surface_layer2_->SetForceRenderSurface(true);
    surface_layer2_->SetOpacity(0.5f);
    surface_layer1_->AddChild(surface_layer2_);

    replica_layer1_ = FakeContentLayer::Create(&client_);
    surface_layer1_->SetReplicaLayer(replica_layer1_.get());

    replica_layer2_ = FakeContentLayer::Create(&client_);
    surface_layer2_->SetReplicaLayer(replica_layer2_.get());

    layer_tree_host()->SetRootLayer(root_layer_);
    LayerTreeHostTest::SetupTree();
  }

  virtual void BeginTest() OVERRIDE {
    PostSetNeedsCommitToMainThread();
  }

  virtual void DrawLayersOnThread(LayerTreeHostImpl* host_impl) OVERRIDE {
    Renderer* renderer = host_impl->renderer();
    RenderPass::Id surface1_render_pass_id = host_impl->active_tree()
        ->root_layer()->children()[0]->render_surface()->RenderPassId();
    RenderPass::Id surface2_render_pass_id =
        host_impl->active_tree()->root_layer()->children()[0]->children()[0]
        ->render_surface()->RenderPassId();

    switch (host_impl->active_tree()->source_frame_number()) {
      case 0:
        EXPECT_TRUE(renderer->HaveCachedResourcesForRenderPassId(
            surface1_render_pass_id));
        EXPECT_TRUE(renderer->HaveCachedResourcesForRenderPassId(
            surface2_render_pass_id));

        // Reduce the memory limit to only fit the root layer and one render
        // surface. This prevents any contents drawing into surfaces
        // from being allocated.
        host_impl->SetMemoryPolicy(
            ManagedMemoryPolicy(100 * 100 * 4 * 2), true);
        break;
      case 1:
        EXPECT_FALSE(renderer->HaveCachedResourcesForRenderPassId(
            surface1_render_pass_id));
        EXPECT_FALSE(renderer->HaveCachedResourcesForRenderPassId(
            surface2_render_pass_id));

        EndTest();
        break;
    }
  }

  virtual void DidCommitAndDrawFrame() OVERRIDE {
    if (layer_tree_host()->commit_number() < 2)
      root_layer_->SetNeedsDisplay();
  }

  virtual void AfterTest() OVERRIDE {
    EXPECT_LE(2u, root_layer_->update_count());
    EXPECT_LE(2u, surface_layer1_->update_count());
    EXPECT_LE(2u, surface_layer2_->update_count());
  }

  FakeContentLayerClient client_;
  scoped_refptr<FakeContentLayer> root_layer_;
  scoped_refptr<FakeContentLayer> surface_layer1_;
  scoped_refptr<FakeContentLayer> replica_layer1_;
  scoped_refptr<FakeContentLayer> surface_layer2_;
  scoped_refptr<FakeContentLayer> replica_layer2_;
};

// Surfaces don't exist with a delegated renderer.
SINGLE_AND_MULTI_THREAD_DIRECT_RENDERER_TEST_F(
    LayerTreeHostTestSurfaceNotAllocatedForLayersOutsideMemoryLimit);

class EvictionTestLayer : public Layer {
 public:
  static scoped_refptr<EvictionTestLayer> Create() {
    return make_scoped_refptr(new EvictionTestLayer());
  }

  virtual bool Update(ResourceUpdateQueue*,
                      const OcclusionTracker*) OVERRIDE;
  virtual bool DrawsContent() const OVERRIDE { return true; }

  virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
      OVERRIDE;
  virtual void PushPropertiesTo(LayerImpl* impl) OVERRIDE;
  virtual void SetTexturePriorities(const PriorityCalculator&) OVERRIDE;

  bool HaveBackingTexture() const {
    return texture_.get() ? texture_->have_backing_texture() : false;
  }

 private:
  EvictionTestLayer() : Layer() {}
  virtual ~EvictionTestLayer() {}

  void CreateTextureIfNeeded() {
    if (texture_)
      return;
    texture_ = PrioritizedResource::Create(
        layer_tree_host()->contents_texture_manager());
    texture_->SetDimensions(gfx::Size(10, 10), GL_RGBA);
    bitmap_.setConfig(SkBitmap::kARGB_8888_Config, 10, 10);
  }

  scoped_ptr<PrioritizedResource> texture_;
  SkBitmap bitmap_;
};

class EvictionTestLayerImpl : public LayerImpl {
 public:
  static scoped_ptr<EvictionTestLayerImpl> Create(LayerTreeImpl* tree_impl,
                                                  int id) {
    return make_scoped_ptr(new EvictionTestLayerImpl(tree_impl, id));
  }
  virtual ~EvictionTestLayerImpl() {}

  virtual void AppendQuads(QuadSink* quad_sink,
                           AppendQuadsData* append_quads_data) OVERRIDE {
    ASSERT_TRUE(has_texture_);
    ASSERT_NE(0u, layer_tree_impl()->resource_provider()->num_resources());
  }

  void SetHasTexture(bool has_texture) { has_texture_ = has_texture; }

 private:
  EvictionTestLayerImpl(LayerTreeImpl* tree_impl, int id)
      : LayerImpl(tree_impl, id), has_texture_(false) {}

  bool has_texture_;
};

void EvictionTestLayer::SetTexturePriorities(const PriorityCalculator&) {
  CreateTextureIfNeeded();
  if (!texture_)
    return;
  texture_->set_request_priority(PriorityCalculator::UIPriority(true));
}

bool EvictionTestLayer::Update(ResourceUpdateQueue* queue,
                               const OcclusionTracker*) {
  CreateTextureIfNeeded();
  if (!texture_)
    return false;

  gfx::Rect full_rect(0, 0, 10, 10);
  ResourceUpdate upload = ResourceUpdate::Create(
      texture_.get(), &bitmap_, full_rect, full_rect, gfx::Vector2d());
  queue->AppendFullUpload(upload);
  return true;
}

scoped_ptr<LayerImpl> EvictionTestLayer::CreateLayerImpl(
    LayerTreeImpl* tree_impl) {
  return EvictionTestLayerImpl::Create(tree_impl, layer_id_)
      .PassAs<LayerImpl>();
}

void EvictionTestLayer::PushPropertiesTo(LayerImpl* layer_impl) {
  Layer::PushPropertiesTo(layer_impl);

  EvictionTestLayerImpl* test_layer_impl =
      static_cast<EvictionTestLayerImpl*>(layer_impl);
  test_layer_impl->SetHasTexture(texture_->have_backing_texture());
}

class LayerTreeHostTestEvictTextures : public LayerTreeHostTest {
 public:
  LayerTreeHostTestEvictTextures()
      : layer_(EvictionTestLayer::Create()),
        impl_for_evict_textures_(0),
        num_commits_(0) {}

  virtual void BeginTest() OVERRIDE {
    layer_tree_host()->SetRootLayer(layer_);
    layer_tree_host()->SetViewportSize(gfx::Size(10, 20));

    gfx::Transform identity_matrix;
    SetLayerPropertiesForTesting(layer_.get(),
                                 0,
                                 identity_matrix,
                                 gfx::PointF(0.f, 0.f),
                                 gfx::PointF(0.f, 0.f),
                                 gfx::Size(10, 20),
                                 true);

    PostSetNeedsCommitToMainThread();
  }

  void PostEvictTextures() {
    DCHECK(HasImplThread());
    ImplThreadTaskRunner()->PostTask(
        FROM_HERE,
        base::Bind(&LayerTreeHostTestEvictTextures::EvictTexturesOnImplThread,
                   base::Unretained(this)));
  }

  void EvictTexturesOnImplThread() {
    DCHECK(impl_for_evict_textures_);
    impl_for_evict_textures_->EvictTexturesForTesting();
  }

  // Commit 1: Just commit and draw normally, then post an eviction at the end
  // that will trigger a commit.
  // Commit 2: Triggered by the eviction, let it go through and then set
  // needsCommit.
  // Commit 3: Triggered by the setNeedsCommit. In Layout(), post an eviction
  // task, which will be handled before the commit. Don't set needsCommit, it
  // should have been posted. A frame should not be drawn (note,
  // didCommitAndDrawFrame may be called anyway).
  // Commit 4: Triggered by the eviction, let it go through and then set
  // needsCommit.
  // Commit 5: Triggered by the setNeedsCommit, post an eviction task in
  // Layout(), a frame should not be drawn but a commit will be posted.
  // Commit 6: Triggered by the eviction, post an eviction task in
  // Layout(), which will be a noop, letting the commit (which recreates the
  // textures) go through and draw a frame, then end the test.
  //
  // Commits 1+2 test the eviction recovery path where eviction happens outside
  // of the beginFrame/commit pair.
  // Commits 3+4 test the eviction recovery path where eviction happens inside
  // the beginFrame/commit pair.
  // Commits 5+6 test the path where an eviction happens during the eviction
  // recovery path.
  virtual void DidCommit() OVERRIDE {
    switch (num_commits_) {
      case 1:
        EXPECT_TRUE(layer_->HaveBackingTexture());
        PostEvictTextures();
        break;
      case 2:
        EXPECT_TRUE(layer_->HaveBackingTexture());
        layer_tree_host()->SetNeedsCommit();
        break;
      case 3:
        break;
      case 4:
        EXPECT_TRUE(layer_->HaveBackingTexture());
        layer_tree_host()->SetNeedsCommit();
        break;
      case 5:
        break;
      case 6:
        EXPECT_TRUE(layer_->HaveBackingTexture());
        EndTest();
        break;
      default:
        NOTREACHED();
        break;
    }
  }

  virtual void CommitCompleteOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    impl_for_evict_textures_ = impl;
  }

  virtual void Layout() OVERRIDE {
    ++num_commits_;
    switch (num_commits_) {
      case 1:
      case 2:
        break;
      case 3:
        PostEvictTextures();
        break;
      case 4:
        // We couldn't check in didCommitAndDrawFrame on commit 3,
        // so check here.
        EXPECT_FALSE(layer_->HaveBackingTexture());
        break;
      case 5:
        PostEvictTextures();
        break;
      case 6:
        // We couldn't check in didCommitAndDrawFrame on commit 5,
        // so check here.
        EXPECT_FALSE(layer_->HaveBackingTexture());
        PostEvictTextures();
        break;
      default:
        NOTREACHED();
        break;
    }
  }

  virtual void AfterTest() OVERRIDE {}

 private:
  FakeContentLayerClient client_;
  scoped_refptr<EvictionTestLayer> layer_;
  LayerTreeHostImpl* impl_for_evict_textures_;
  int num_commits_;
};

MULTI_THREAD_TEST_F(LayerTreeHostTestEvictTextures);

class LayerTreeHostTestContinuousCommit : public LayerTreeHostTest {
 public:
  LayerTreeHostTestContinuousCommit()
      : num_commit_complete_(0), num_draw_layers_(0) {}

  virtual void BeginTest() OVERRIDE {
    layer_tree_host()->SetViewportSize(gfx::Size(10, 10));
    layer_tree_host()->root_layer()->SetBounds(gfx::Size(10, 10));

    PostSetNeedsCommitToMainThread();
  }

  virtual void DidCommit() OVERRIDE {
    if (num_draw_layers_ == 2)
      return;
    layer_tree_host()->root_layer()->SetNeedsDisplay();
  }

  virtual void CommitCompleteOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    if (num_draw_layers_ == 1)
      num_commit_complete_++;
  }

  virtual void DrawLayersOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    num_draw_layers_++;
    if (num_draw_layers_ == 2)
      EndTest();
  }

  virtual void AfterTest() OVERRIDE {
    // Check that we didn't commit twice between first and second draw.
    EXPECT_EQ(1, num_commit_complete_);
  }

 private:
  int num_commit_complete_;
  int num_draw_layers_;
};

MULTI_THREAD_TEST_F(LayerTreeHostTestContinuousCommit);

class LayerTreeHostTestContinuousInvalidate : public LayerTreeHostTest {
 public:
  LayerTreeHostTestContinuousInvalidate()
      : num_commit_complete_(0), num_draw_layers_(0) {}

  virtual void BeginTest() OVERRIDE {
    layer_tree_host()->SetViewportSize(gfx::Size(10, 10));
    layer_tree_host()->root_layer()->SetBounds(gfx::Size(10, 10));

    content_layer_ = ContentLayer::Create(&client_);
    content_layer_->SetBounds(gfx::Size(10, 10));
    content_layer_->SetPosition(gfx::PointF(0.f, 0.f));
    content_layer_->SetAnchorPoint(gfx::PointF(0.f, 0.f));
    content_layer_->SetIsDrawable(true);
    layer_tree_host()->root_layer()->AddChild(content_layer_);

    PostSetNeedsCommitToMainThread();
  }

  virtual void DidCommitAndDrawFrame() OVERRIDE {
    if (num_draw_layers_ == 2)
      return;
    content_layer_->SetNeedsDisplay();
  }

  virtual void CommitCompleteOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    if (num_draw_layers_ == 1)
      num_commit_complete_++;
  }

  virtual void DrawLayersOnThread(LayerTreeHostImpl* impl) OVERRIDE {
    num_draw_layers_++;
    if (num_draw_layers_ == 2)
      EndTest();
  }

  virtual void AfterTest() OVERRIDE {
    // Check that we didn't commit twice between first and second draw.
    EXPECT_EQ(1, num_commit_complete_);
  }

 private:
  FakeContentLayerClient client_;
  scoped_refptr<Layer> content_layer_;
  int num_commit_complete_;
  int num_draw_layers_;
};

MULTI_THREAD_TEST_F(LayerTreeHostTestContinuousInvalidate);

class LayerTreeHostTestDeferCommits : public LayerTreeHostTest {
 public:
  LayerTreeHostTestDeferCommits()
      : num_commits_deferred_(0), num_complete_commits_(0) {}

  virtual void BeginTest() OVERRIDE { PostSetNeedsCommitToMainThread(); }

  virtual void DidDeferCommit() OVERRIDE {
    num_commits_deferred_++;
    layer_tree_host()->SetDeferCommits(false);
  }

  virtual void DidCommit() OVERRIDE {
    num_complete_commits_++;
    switch (num_complete_commits_) {
      case 1:
        EXPECT_EQ(0, num_commits_deferred_);
        layer_tree_host()->SetDeferCommits(true);
        PostSetNeedsCommitToMainThread();
        break;
      case 2:
        EndTest();
        break;
      default:
        NOTREACHED();
        break;
    }
  }

  virtual void AfterTest() OVERRIDE {
    EXPECT_EQ(1, num_commits_deferred_);
    EXPECT_EQ(2, num_complete_commits_);
  }

 private:
  int num_commits_deferred_;
  int num_complete_commits_;
};

MULTI_THREAD_TEST_F(LayerTreeHostTestDeferCommits);

class LayerTreeHostWithProxy : public LayerTreeHost {
 public:
  LayerTreeHostWithProxy(FakeLayerTreeHostClient* client,
                         const LayerTreeSettings& settings,
                         scoped_ptr<FakeProxy> proxy)
      : LayerTreeHost(client, settings) {
        proxy->SetLayerTreeHost(this);
    EXPECT_TRUE(InitializeForTesting(proxy.PassAs<Proxy>()));
  }
};

TEST(LayerTreeHostTest, LimitPartialUpdates) {
  // When partial updates are not allowed, max updates should be 0.
  {
    FakeLayerTreeHostClient client(FakeLayerTreeHostClient::DIRECT_3D);

    scoped_ptr<FakeProxy> proxy(new FakeProxy);
    proxy->GetRendererCapabilities().allow_partial_texture_updates = false;
    proxy->SetMaxPartialTextureUpdates(5);

    LayerTreeSettings settings;
    settings.max_partial_texture_updates = 10;

    LayerTreeHostWithProxy host(&client, settings, proxy.Pass());
    EXPECT_TRUE(host.InitializeOutputSurfaceIfNeeded());

    EXPECT_EQ(0u, host.settings().max_partial_texture_updates);
  }

  // When partial updates are allowed,
  // max updates should be limited by the proxy.
  {
    FakeLayerTreeHostClient client(FakeLayerTreeHostClient::DIRECT_3D);

    scoped_ptr<FakeProxy> proxy(new FakeProxy);
    proxy->GetRendererCapabilities().allow_partial_texture_updates = true;
    proxy->SetMaxPartialTextureUpdates(5);

    LayerTreeSettings settings;
    settings.max_partial_texture_updates = 10;

    LayerTreeHostWithProxy host(&client, settings, proxy.Pass());
    EXPECT_TRUE(host.InitializeOutputSurfaceIfNeeded());

    EXPECT_EQ(5u, host.settings().max_partial_texture_updates);
  }

  // When partial updates are allowed,
  // max updates should also be limited by the settings.
  {
    FakeLayerTreeHostClient client(FakeLayerTreeHostClient::DIRECT_3D);

    scoped_ptr<FakeProxy> proxy(new FakeProxy);
    proxy->GetRendererCapabilities().allow_partial_texture_updates = true;
    proxy->SetMaxPartialTextureUpdates(20);

    LayerTreeSettings settings;
    settings.max_partial_texture_updates = 10;

    LayerTreeHostWithProxy host(&client, settings, proxy.Pass());
    EXPECT_TRUE(host.InitializeOutputSurfaceIfNeeded());

    EXPECT_EQ(10u, host.settings().max_partial_texture_updates);
  }
}

TEST(LayerTreeHostTest, PartialUpdatesWithGLRenderer) {
  FakeLayerTreeHostClient client(FakeLayerTreeHostClient::DIRECT_3D);

  LayerTreeSettings settings;
  settings.max_partial_texture_updates = 4;

  scoped_ptr<LayerTreeHost> host =
      LayerTreeHost::Create(&client, settings, NULL);
  EXPECT_TRUE(host->InitializeOutputSurfaceIfNeeded());
  EXPECT_EQ(4u, host->settings().max_partial_texture_updates);
}

TEST(LayerTreeHostTest, PartialUpdatesWithSoftwareRenderer) {
  FakeLayerTreeHostClient client(FakeLayerTreeHostClient::DIRECT_SOFTWARE);

  LayerTreeSettings settings;
  settings.max_partial_texture_updates = 4;

  scoped_ptr<LayerTreeHost> host =
      LayerTreeHost::Create(&client, settings, NULL);
  EXPECT_TRUE(host->InitializeOutputSurfaceIfNeeded());
  EXPECT_EQ(4u, host->settings().max_partial_texture_updates);
}

TEST(LayerTreeHostTest, PartialUpdatesWithDelegatingRendererAndGLContent) {
  FakeLayerTreeHostClient client(FakeLayerTreeHostClient::DELEGATED_3D);

  LayerTreeSettings settings;
  settings.max_partial_texture_updates = 4;

  scoped_ptr<LayerTreeHost> host =
      LayerTreeHost::Create(&client, settings, NULL);
  EXPECT_TRUE(host->InitializeOutputSurfaceIfNeeded());
  EXPECT_EQ(0u, host->settings().max_partial_texture_updates);
}

TEST(LayerTreeHostTest,
     PartialUpdatesWithDelegatingRendererAndSoftwareContent) {
  FakeLayerTreeHostClient client(FakeLayerTreeHostClient::DELEGATED_SOFTWARE);

  LayerTreeSettings settings;
  settings.max_partial_texture_updates = 4;

  scoped_ptr<LayerTreeHost> host =
      LayerTreeHost::Create(&client, settings, NULL);
  EXPECT_TRUE(host->InitializeOutputSurfaceIfNeeded());
  EXPECT_EQ(0u, host->settings().max_partial_texture_updates);
}

class LayerTreeHostTestShutdownWithOnlySomeResourcesEvicted
    : public LayerTreeHostTest {
 public:
  LayerTreeHostTestShutdownWithOnlySomeResourcesEvicted()
      : root_layer_(FakeContentLayer::Create(&client_)),
        child_layer1_(FakeContentLayer::Create(&client_)),
        child_layer2_(FakeContentLayer::Create(&client_)),
        num_commits_(0) {}

  virtual void BeginTest() OVERRIDE {
    layer_tree_host()->SetViewportSize(gfx::Size(100, 100));
    root_layer_->SetBounds(gfx::Size(100, 100));
    child_layer1_->SetBounds(gfx::Size(100, 100));
    child_layer2_->SetBounds(gfx::Size(100, 100));
    root_layer_->AddChild(child_layer1_);
    root_layer_->AddChild(child_layer2_);
    layer_tree_host()->SetRootLayer(root_layer_);
    PostSetNeedsCommitToMainThread();
  }

  virtual void DidSetVisibleOnImplTree(LayerTreeHostImpl* host_impl,
                                       bool visible) OVERRIDE {
    // One backing should remain unevicted.
    EXPECT_EQ(100u * 100u * 4u * 1u,
              layer_tree_host()->contents_texture_manager()->MemoryUseBytes());
    // Make sure that contents textures are marked as having been
    // purged.
    EXPECT_TRUE(host_impl->active_tree()->ContentsTexturesPurged());
    // End the test in this state.
    EndTest();
  }

  virtual void DidActivateTreeOnThread(LayerTreeHostImpl* host_impl) OVERRIDE {
    ++num_commits_;
    switch (num_commits_) {
      case 1:
        // All three backings should have memory.
        EXPECT_EQ(
            100u * 100u * 4u * 3u,
            layer_tree_host()->contents_texture_manager()->MemoryUseBytes());
        // Set a new policy that will kick out 1 of the 3 resources.
        // Because a resource was evicted, a commit will be kicked off.
        host_impl->SetMemoryPolicy(
            ManagedMemoryPolicy(100 * 100 * 4 * 2,
                                ManagedMemoryPolicy::CUTOFF_ALLOW_EVERYTHING,
                                100 * 100 * 4 * 1,
                                ManagedMemoryPolicy::CUTOFF_ALLOW_EVERYTHING),
            true);
        break;
      case 2:
        // Only two backings should have memory.
        EXPECT_EQ(
            100u * 100u * 4u * 2u,
            layer_tree_host()->contents_texture_manager()->MemoryUseBytes());
        // Become backgrounded, which will cause 1 more resource to be
        // evicted.
        PostSetVisibleToMainThread(false);
        break;
      default:
        // No further commits should happen because this is not visible
        // anymore.
        NOTREACHED();
        break;
    }
  }

  virtual void AfterTest() OVERRIDE {}

 private:
  FakeContentLayerClient client_;
  scoped_refptr<FakeContentLayer> root_layer_;
  scoped_refptr<FakeContentLayer> child_layer1_;
  scoped_refptr<FakeContentLayer> child_layer2_;
  int num_commits_;
};

SINGLE_AND_MULTI_THREAD_TEST_F(
    LayerTreeHostTestShutdownWithOnlySomeResourcesEvicted);

class LayerTreeHostTestLCDNotification : public LayerTreeHostTest {
 public:
  class NotificationClient : public ContentLayerClient {
   public:
    NotificationClient()
        : layer_(0), paint_count_(0), lcd_notification_count_(0) {}

    void set_layer(Layer* layer) { layer_ = layer; }
    int paint_count() const { return paint_count_; }
    int lcd_notification_count() const { return lcd_notification_count_; }

    virtual void PaintContents(SkCanvas* canvas,
                               gfx::Rect clip,
                               gfx::RectF* opaque) OVERRIDE {
      ++paint_count_;
    }
    virtual void DidChangeLayerCanUseLCDText() OVERRIDE {
      ++lcd_notification_count_;
      layer_->SetNeedsDisplay();
    }

   private:
    Layer* layer_;
    int paint_count_;
    int lcd_notification_count_;
  };

  virtual void SetupTree() OVERRIDE {
    scoped_refptr<ContentLayer> root_layer = ContentLayer::Create(&client_);
    root_layer->SetIsDrawable(true);
    root_layer->SetBounds(gfx::Size(1, 1));

    layer_tree_host()->SetRootLayer(root_layer);
    client_.set_layer(root_layer.get());

    // The expecations are based on the assumption that the default
    // LCD settings are:
    EXPECT_TRUE(layer_tree_host()->settings().can_use_lcd_text);
    EXPECT_FALSE(root_layer->can_use_lcd_text());

    LayerTreeHostTest::SetupTree();
  }

  virtual void BeginTest() OVERRIDE { PostSetNeedsCommitToMainThread(); }
  virtual void AfterTest() OVERRIDE {}

  virtual void DidCommit() OVERRIDE {
    switch (layer_tree_host()->commit_number()) {
      case 1:
        // The first update consists one LCD notification and one paint.
        EXPECT_EQ(1, client_.lcd_notification_count());
        EXPECT_EQ(1, client_.paint_count());
        // LCD text must have been enabled on the layer.
        EXPECT_TRUE(layer_tree_host()->root_layer()->can_use_lcd_text());
        PostSetNeedsCommitToMainThread();
        break;
      case 2:
        // Since nothing changed on layer, there should be no notification
        // or paint on the second update.
        EXPECT_EQ(1, client_.lcd_notification_count());
        EXPECT_EQ(1, client_.paint_count());
        // LCD text must not have changed.
        EXPECT_TRUE(layer_tree_host()->root_layer()->can_use_lcd_text());
        // Change layer opacity that should trigger lcd notification.
        layer_tree_host()->root_layer()->SetOpacity(.5f);
        // No need to request a commit - setting opacity will do it.
        break;
      default:
        // Verify that there is not extra commit due to layer invalidation.
        EXPECT_EQ(3, layer_tree_host()->commit_number());
        // LCD notification count should have incremented due to
        // change in layer opacity.
        EXPECT_EQ(2, client_.lcd_notification_count());
        // Paint count should be incremented due to invalidation.
        EXPECT_EQ(2, client_.paint_count());
        // LCD text must have been disabled on the layer due to opacity.
        EXPECT_FALSE(layer_tree_host()->root_layer()->can_use_lcd_text());
        EndTest();
        break;
    }
  }

 private:
  NotificationClient client_;
};

SINGLE_THREAD_TEST_F(LayerTreeHostTestLCDNotification);

// Verify that the BeginFrame notification is used to initiate rendering.
class LayerTreeHostTestBeginFrameNotification : public LayerTreeHostTest {
 public:
  virtual void InitializeSettings(LayerTreeSettings* settings) OVERRIDE {
    settings->begin_frame_scheduling_enabled = true;
  }

  virtual void BeginTest() OVERRIDE {
    // This will trigger a SetNeedsBeginFrame which will trigger a BeginFrame.
    PostSetNeedsCommitToMainThread();
  }

  virtual bool PrepareToDrawOnThread(
      LayerTreeHostImpl* host_impl,
      LayerTreeHostImpl::FrameData* frame,
      bool result) OVERRIDE {
    EndTest();
    return true;
  }

  virtual void AfterTest() OVERRIDE {}

 private:
  base::TimeTicks frame_time_;
};

MULTI_THREAD_TEST_F(LayerTreeHostTestBeginFrameNotification);

class LayerTreeHostTestBeginFrameNotificationShutdownWhileEnabled
    : public LayerTreeHostTest {
 public:
  virtual void InitializeSettings(LayerTreeSettings* settings) OVERRIDE {
    settings->begin_frame_scheduling_enabled = true;
    settings->using_synchronous_renderer_compositor = true;
  }

  virtual void BeginTest() OVERRIDE { PostSetNeedsCommitToMainThread(); }

  virtual void CommitCompleteOnThread(LayerTreeHostImpl* host_impl) OVERRIDE {
    // The BeginFrame notification is turned off now but will get enabled
    // once we return. End test while it's enabled.
    ImplThreadTaskRunner()->PostTask(
        FROM_HERE,
        base::Bind(&LayerTreeHostTestBeginFrameNotification::EndTest,
                   base::Unretained(this)));
  }

  virtual void AfterTest() OVERRIDE {}
};

MULTI_THREAD_TEST_F(
    LayerTreeHostTestBeginFrameNotificationShutdownWhileEnabled);

class LayerTreeHostTestUninvertibleTransformDoesNotBlockActivation
    : public LayerTreeHostTest {
 protected:
  virtual void InitializeSettings(LayerTreeSettings* settings) OVERRIDE {
    settings->impl_side_painting = true;
  }

  virtual void SetupTree() OVERRIDE {
    LayerTreeHostTest::SetupTree();

    scoped_refptr<Layer> layer = PictureLayer::Create(&client_);
    layer->SetTransform(gfx::Transform(0.0, 0.0, 0.0, 0.0, 0.0, 0.0));
    layer->SetBounds(gfx::Size(10, 10));
    layer_tree_host()->root_layer()->AddChild(layer);
  }

  virtual void BeginTest() OVERRIDE {
    PostSetNeedsCommitToMainThread();
  }

  virtual void DidActivateTreeOnThread(LayerTreeHostImpl* host_impl) OVERRIDE {
    EndTest();
  }

  virtual void AfterTest() OVERRIDE {
  }

  FakeContentLayerClient client_;
};

MULTI_THREAD_TEST_F(
    LayerTreeHostTestUninvertibleTransformDoesNotBlockActivation);

class LayerTreeHostTestChangeLayerPropertiesInPaintContents
    : public LayerTreeHostTest {
 public:
  class SetBoundsClient : public ContentLayerClient {
   public:
    SetBoundsClient() : layer_(0) {}

    void set_layer(Layer* layer) { layer_ = layer; }

    virtual void PaintContents(SkCanvas* canvas,
                               gfx::Rect clip,
                               gfx::RectF* opaque) OVERRIDE {
      layer_->SetBounds(gfx::Size(2, 2));
    }

    virtual void DidChangeLayerCanUseLCDText() OVERRIDE {}

   private:
    Layer* layer_;
  };

  LayerTreeHostTestChangeLayerPropertiesInPaintContents() : num_commits_(0) {}

  virtual void SetupTree() OVERRIDE {
    scoped_refptr<ContentLayer> root_layer = ContentLayer::Create(&client_);
    root_layer->SetIsDrawable(true);
    root_layer->SetBounds(gfx::Size(1, 1));

    layer_tree_host()->SetRootLayer(root_layer);
    client_.set_layer(root_layer.get());

    LayerTreeHostTest::SetupTree();
  }

  virtual void BeginTest() OVERRIDE { PostSetNeedsCommitToMainThread(); }
  virtual void AfterTest() OVERRIDE {}

  virtual void CommitCompleteOnThread(LayerTreeHostImpl* host_impl) OVERRIDE {
    num_commits_++;
    if (num_commits_ == 1) {
      LayerImpl* root_layer = host_impl->active_tree()->root_layer();
      EXPECT_SIZE_EQ(gfx::Size(1, 1), root_layer->bounds());
    } else {
      LayerImpl* root_layer = host_impl->active_tree()->root_layer();
      EXPECT_SIZE_EQ(gfx::Size(2, 2), root_layer->bounds());
      EndTest();
    }
  }

 private:
  SetBoundsClient client_;
  int num_commits_;
};

SINGLE_THREAD_TEST_F(LayerTreeHostTestChangeLayerPropertiesInPaintContents);

class MockIOSurfaceWebGraphicsContext3D : public FakeWebGraphicsContext3D {
 public:
  MockIOSurfaceWebGraphicsContext3D()
      : FakeWebGraphicsContext3D() {}

  virtual WebKit::WebGLId createTexture() OVERRIDE {
    return 1;
  }

  virtual WebKit::WebString getString(WebKit::WGC3Denum name) OVERRIDE {
    if (name == GL_EXTENSIONS) {
      return WebKit::WebString(
          "GL_CHROMIUM_iosurface GL_ARB_texture_rectangle");
    }
    return WebKit::WebString();
  }

  MOCK_METHOD1(activeTexture, void(WebKit::WGC3Denum texture));
  MOCK_METHOD2(bindTexture, void(WebKit::WGC3Denum target,
                                WebKit::WebGLId texture_id));
  MOCK_METHOD3(texParameteri, void(WebKit::WGC3Denum target,
                                   WebKit::WGC3Denum pname,
                                   WebKit::WGC3Dint param));
  MOCK_METHOD5(texImageIOSurface2DCHROMIUM, void(WebKit::WGC3Denum target,
                                                 WebKit::WGC3Dint width,
                                                 WebKit::WGC3Dint height,
                                                 WebKit::WGC3Duint ioSurfaceId,
                                                 WebKit::WGC3Duint plane));
  MOCK_METHOD4(drawElements, void(WebKit::WGC3Denum mode,
                                  WebKit::WGC3Dsizei count,
                                  WebKit::WGC3Denum type,
                                  WebKit::WGC3Dintptr offset));
};


class LayerTreeHostTestIOSurfaceDrawing : public LayerTreeHostTest {
 protected:
  virtual scoped_ptr<OutputSurface> CreateOutputSurface() OVERRIDE {
    scoped_ptr<MockIOSurfaceWebGraphicsContext3D> context(
        new MockIOSurfaceWebGraphicsContext3D);
    mock_context_ = context.get();
    scoped_ptr<OutputSurface> output_surface = FakeOutputSurface::Create3d(
        context.PassAs<WebKit::WebGraphicsContext3D>()).PassAs<OutputSurface>();
    return output_surface.Pass();
  }

  virtual void SetupTree() OVERRIDE {
    LayerTreeHostTest::SetupTree();

    layer_tree_host()->root_layer()->SetIsDrawable(false);

    io_surface_id_ = 9;
    io_surface_size_ = gfx::Size(6, 7);

    scoped_refptr<IOSurfaceLayer> io_surface_layer = IOSurfaceLayer::Create();
    io_surface_layer->SetBounds(gfx::Size(10, 10));
    io_surface_layer->SetAnchorPoint(gfx::PointF());
    io_surface_layer->SetIsDrawable(true);
    io_surface_layer->SetIOSurfaceProperties(io_surface_id_, io_surface_size_);
    layer_tree_host()->root_layer()->AddChild(io_surface_layer);
  }

  virtual void BeginTest() OVERRIDE {
    PostSetNeedsCommitToMainThread();
  }

  virtual void DidActivateTreeOnThread(LayerTreeHostImpl* host_impl) OVERRIDE {
    // In WillDraw, the IOSurfaceLayer sets up the io surface texture.

    EXPECT_CALL(*mock_context_, activeTexture(_))
        .Times(0);
    EXPECT_CALL(*mock_context_, bindTexture(GL_TEXTURE_RECTANGLE_ARB, 1))
        .Times(AtLeast(1));
    EXPECT_CALL(*mock_context_, texParameteri(GL_TEXTURE_RECTANGLE_ARB,
                                              GL_TEXTURE_MIN_FILTER,
                                              GL_LINEAR))
        .Times(1);
    EXPECT_CALL(*mock_context_, texParameteri(GL_TEXTURE_RECTANGLE_ARB,
                                              GL_TEXTURE_MAG_FILTER,
                                              GL_LINEAR))
        .Times(1);
    EXPECT_CALL(*mock_context_, texParameteri(GL_TEXTURE_RECTANGLE_ARB,
                                              GL_TEXTURE_WRAP_S,
                                              GL_CLAMP_TO_EDGE))
        .Times(1);
    EXPECT_CALL(*mock_context_, texParameteri(GL_TEXTURE_RECTANGLE_ARB,
                                              GL_TEXTURE_WRAP_T,
                                              GL_CLAMP_TO_EDGE))
        .Times(1);

    EXPECT_CALL(*mock_context_, texImageIOSurface2DCHROMIUM(
        GL_TEXTURE_RECTANGLE_ARB,
        io_surface_size_.width(),
        io_surface_size_.height(),
        io_surface_id_,
        0))
        .Times(1);

    EXPECT_CALL(*mock_context_, bindTexture(_, 0))
        .Times(AnyNumber());
  }

  virtual bool PrepareToDrawOnThread(
      LayerTreeHostImpl* host_impl,
      LayerTreeHostImpl::FrameData* frame,
      bool result) OVERRIDE {
    Mock::VerifyAndClearExpectations(&mock_context_);

    // The io surface layer's texture is drawn.
    EXPECT_CALL(*mock_context_, activeTexture(GL_TEXTURE0))
        .Times(AtLeast(1));
    EXPECT_CALL(*mock_context_, bindTexture(GL_TEXTURE_RECTANGLE_ARB, 1))
        .Times(1);
    EXPECT_CALL(*mock_context_, drawElements(GL_TRIANGLES, 6, _, _))
        .Times(AtLeast(1));

    return result;
  }

  virtual void DrawLayersOnThread(LayerTreeHostImpl* host_impl) OVERRIDE {
    Mock::VerifyAndClearExpectations(&mock_context_);
    EndTest();
  }

  virtual void AfterTest() OVERRIDE {}

  int io_surface_id_;
  MockIOSurfaceWebGraphicsContext3D* mock_context_;
  gfx::Size io_surface_size_;
};

// TODO(danakj): IOSurface layer can not be transported. crbug.com/239335
SINGLE_AND_MULTI_THREAD_DIRECT_RENDERER_TEST_F(
    LayerTreeHostTestIOSurfaceDrawing);

class LayerTreeHostTestAsyncReadback : public LayerTreeHostTest {
 protected:
  virtual void SetupTree() OVERRIDE {
    root = FakeContentLayer::Create(&client_);
    root->SetBounds(gfx::Size(20, 20));

    child = FakeContentLayer::Create(&client_);
    child->SetBounds(gfx::Size(10, 10));
    root->AddChild(child);

    layer_tree_host()->SetRootLayer(root);
    LayerTreeHostTest::SetupTree();
  }

  virtual void BeginTest() OVERRIDE {
    PostSetNeedsCommitToMainThread();
  }

  virtual void DidCommitAndDrawFrame() OVERRIDE {
    WaitForCallback();
  }

  void WaitForCallback() {
    base::MessageLoop::current()->PostTask(
        FROM_HERE,
        base::Bind(
            &LayerTreeHostTestAsyncReadback::NextStep,
            base::Unretained(this)));
  }

  void NextStep() {
    int frame = layer_tree_host()->commit_number();
    switch (frame) {
      case 1:
        child->RequestCopyOfOutput(CopyOutputRequest::CreateBitmapRequest(
            base::Bind(&LayerTreeHostTestAsyncReadback::CopyOutputCallback,
                       base::Unretained(this))));
        EXPECT_EQ(0u, callbacks_.size());
        break;
      case 2:
        if (callbacks_.size() < 1u) {
          WaitForCallback();
          return;
        }
        EXPECT_EQ(1u, callbacks_.size());
        EXPECT_EQ(gfx::Size(10, 10).ToString(), callbacks_[0].ToString());

        child->RequestCopyOfOutput(CopyOutputRequest::CreateBitmapRequest(
            base::Bind(&LayerTreeHostTestAsyncReadback::CopyOutputCallback,
                       base::Unretained(this))));
        root->RequestCopyOfOutput(CopyOutputRequest::CreateBitmapRequest(
            base::Bind(&LayerTreeHostTestAsyncReadback::CopyOutputCallback,
                       base::Unretained(this))));
        child->RequestCopyOfOutput(CopyOutputRequest::CreateBitmapRequest(
            base::Bind(&LayerTreeHostTestAsyncReadback::CopyOutputCallback,
                       base::Unretained(this))));
        EXPECT_EQ(1u, callbacks_.size());
        break;
      case 3:
        if (callbacks_.size() < 4u) {
          WaitForCallback();
          return;
        }
        EXPECT_EQ(4u, callbacks_.size());
        // The child was copied to a bitmap and passed back twice.
        EXPECT_EQ(gfx::Size(10, 10).ToString(), callbacks_[1].ToString());
        EXPECT_EQ(gfx::Size(10, 10).ToString(), callbacks_[2].ToString());
        // The root was copied to a bitmap and passed back also.
        EXPECT_EQ(gfx::Size(20, 20).ToString(), callbacks_[3].ToString());
        EndTest();
        break;
    }
  }

  void CopyOutputCallback(scoped_ptr<CopyOutputResult> result) {
    EXPECT_TRUE(layer_tree_host()->proxy()->IsMainThread());
    EXPECT_TRUE(result->HasBitmap());
    scoped_ptr<SkBitmap> bitmap = result->TakeBitmap().Pass();
    EXPECT_EQ(result->size().ToString(),
              gfx::Size(bitmap->width(), bitmap->height()).ToString());
    callbacks_.push_back(result->size());
  }

  virtual void AfterTest() OVERRIDE {
    EXPECT_EQ(4u, callbacks_.size());
  }

  virtual scoped_ptr<OutputSurface> CreateOutputSurface() OVERRIDE {
    if (use_gl_renderer_)
      return FakeOutputSurface::Create3d().PassAs<OutputSurface>();
    return FakeOutputSurface::CreateSoftware(
        make_scoped_ptr(new SoftwareOutputDevice)).PassAs<OutputSurface>();
  }

  bool use_gl_renderer_;
  std::vector<gfx::Size> callbacks_;
  FakeContentLayerClient client_;
  scoped_refptr<FakeContentLayer> root;
  scoped_refptr<FakeContentLayer> child;
};

// Readback can't be done with a delegating renderer.
TEST_F(LayerTreeHostTestAsyncReadback, GLRenderer_RunSingleThread) {
  use_gl_renderer_ = true;
  RunTest(false, false, false);
}

TEST_F(LayerTreeHostTestAsyncReadback,
       GLRenderer_RunMultiThread_MainThreadPainting) {
  use_gl_renderer_ = true;
  RunTest(true, false, false);
}

TEST_F(LayerTreeHostTestAsyncReadback,
       GLRenderer_RunMultiThread_ImplSidePainting) {
  use_gl_renderer_ = true;
  RunTest(true, false, true);
}

TEST_F(LayerTreeHostTestAsyncReadback, SoftwareRenderer_RunSingleThread) {
  use_gl_renderer_ = false;
  RunTest(false, false, false);
}

TEST_F(LayerTreeHostTestAsyncReadback,
       SoftwareRenderer_RunMultiThread_MainThreadPainting) {
  use_gl_renderer_ = false;
  RunTest(true, false, false);
}

TEST_F(LayerTreeHostTestAsyncReadback,
       SoftwareRenderer_RunMultiThread_ImplSidePainting) {
  use_gl_renderer_ = false;
  RunTest(true, false, true);
}

class LayerTreeHostTestAsyncReadbackLayerDestroyed : public LayerTreeHostTest {
 protected:
  virtual void SetupTree() OVERRIDE {
    root_ = FakeContentLayer::Create(&client_);
    root_->SetBounds(gfx::Size(20, 20));

    main_destroyed_ = FakeContentLayer::Create(&client_);
    main_destroyed_->SetBounds(gfx::Size(15, 15));
    root_->AddChild(main_destroyed_);

    impl_destroyed_ = FakeContentLayer::Create(&client_);
    impl_destroyed_->SetBounds(gfx::Size(10, 10));
    root_->AddChild(impl_destroyed_);

    layer_tree_host()->SetRootLayer(root_);
    LayerTreeHostTest::SetupTree();
  }

  virtual void BeginTest() OVERRIDE {
    callback_count_ = 0;
    PostSetNeedsCommitToMainThread();
  }

  virtual void DidCommit() OVERRIDE {
    int frame = layer_tree_host()->commit_number();
    switch (frame) {
      case 1:
        main_destroyed_->RequestCopyOfOutput(
            CopyOutputRequest::CreateBitmapRequest(base::Bind(
                &LayerTreeHostTestAsyncReadbackLayerDestroyed::
                    CopyOutputCallback,
                base::Unretained(this))));
        impl_destroyed_->RequestCopyOfOutput(
            CopyOutputRequest::CreateBitmapRequest(base::Bind(
                &LayerTreeHostTestAsyncReadbackLayerDestroyed::
                    CopyOutputCallback,
                base::Unretained(this))));
        EXPECT_EQ(0, callback_count_);

        // Destroy the main thread layer right away.
        main_destroyed_->RemoveFromParent();
        main_destroyed_ = NULL;

        // Should callback with a NULL bitmap.
        EXPECT_EQ(1, callback_count_);

        // Prevent drawing so we can't make a copy of the impl_destroyed layer.
        layer_tree_host()->SetViewportSize(gfx::Size());
        break;
      case 2:
        // Flush the message loops and make sure the callbacks run.
        layer_tree_host()->SetNeedsCommit();
        break;
      case 3:
        // No drawing means no readback yet.
        EXPECT_EQ(1, callback_count_);

        // Destroy the impl thread layer.
        impl_destroyed_->RemoveFromParent();
        impl_destroyed_ = NULL;

        // No callback yet because it's on the impl side.
        EXPECT_EQ(1, callback_count_);
        break;
      case 4:
        // Flush the message loops and make sure the callbacks run.
        layer_tree_host()->SetNeedsCommit();
        break;
      case 5:
        // We should get another callback with a NULL bitmap.
        EXPECT_EQ(2, callback_count_);
        EndTest();
        break;
    }
  }

  void CopyOutputCallback(scoped_ptr<CopyOutputResult> result) {
    EXPECT_TRUE(layer_tree_host()->proxy()->IsMainThread());
    EXPECT_TRUE(result->IsEmpty());
    ++callback_count_;
  }

  virtual void AfterTest() OVERRIDE {}

  int callback_count_;
  FakeContentLayerClient client_;
  scoped_refptr<FakeContentLayer> root_;
  scoped_refptr<FakeContentLayer> main_destroyed_;
  scoped_refptr<FakeContentLayer> impl_destroyed_;
};

SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostTestAsyncReadbackLayerDestroyed);

class LayerTreeHostTestAsyncReadbackInHiddenSubtree : public LayerTreeHostTest {
 protected:
  virtual void SetupTree() OVERRIDE {
    root_ = FakeContentLayer::Create(&client_);
    root_->SetBounds(gfx::Size(20, 20));

    grand_parent_layer_ = FakeContentLayer::Create(&client_);
    grand_parent_layer_->SetBounds(gfx::Size(15, 15));
    root_->AddChild(grand_parent_layer_);

    // parent_layer_ owns a render surface.
    parent_layer_ = FakeContentLayer::Create(&client_);
    parent_layer_->SetBounds(gfx::Size(15, 15));
    parent_layer_->SetForceRenderSurface(true);
    grand_parent_layer_->AddChild(parent_layer_);

    copy_layer_ = FakeContentLayer::Create(&client_);
    copy_layer_->SetBounds(gfx::Size(10, 10));
    parent_layer_->AddChild(copy_layer_);

    layer_tree_host()->SetRootLayer(root_);
    LayerTreeHostTest::SetupTree();
  }

  void AddCopyRequest(Layer* layer) {
    layer->RequestCopyOfOutput(
        CopyOutputRequest::CreateBitmapRequest(base::Bind(
            &LayerTreeHostTestAsyncReadbackInHiddenSubtree::CopyOutputCallback,
            base::Unretained(this))));
  }

  virtual void BeginTest() OVERRIDE {
    callback_count_ = 0;
    PostSetNeedsCommitToMainThread();

    AddCopyRequest(copy_layer_.get());
  }

  void CopyOutputCallback(scoped_ptr<CopyOutputResult> result) {
    EXPECT_TRUE(layer_tree_host()->proxy()->IsMainThread());
    EXPECT_EQ(copy_layer_->bounds().ToString(), result->size().ToString());
    ++callback_count_;

    switch (callback_count_) {
      case 1:
        // Hide the copy request layer.
        grand_parent_layer_->SetHideLayerAndSubtree(false);
        parent_layer_->SetHideLayerAndSubtree(false);
        copy_layer_->SetHideLayerAndSubtree(true);
        AddCopyRequest(copy_layer_.get());
        break;
      case 2:
        // Hide the copy request layer's parent only.
        grand_parent_layer_->SetHideLayerAndSubtree(false);
        parent_layer_->SetHideLayerAndSubtree(true);
        copy_layer_->SetHideLayerAndSubtree(false);
        AddCopyRequest(copy_layer_.get());
        break;
      case 3:
        // Hide the copy request layer's grand parent only.
        grand_parent_layer_->SetHideLayerAndSubtree(true);
        parent_layer_->SetHideLayerAndSubtree(false);
        copy_layer_->SetHideLayerAndSubtree(false);
        AddCopyRequest(copy_layer_.get());
        break;
      case 4:
        // Hide the copy request layer's parent and grandparent.
        grand_parent_layer_->SetHideLayerAndSubtree(true);
        parent_layer_->SetHideLayerAndSubtree(true);
        copy_layer_->SetHideLayerAndSubtree(false);
        AddCopyRequest(copy_layer_.get());
        break;
      case 5:
        // Hide the copy request layer as well as its parent and grandparent.
        grand_parent_layer_->SetHideLayerAndSubtree(true);
        parent_layer_->SetHideLayerAndSubtree(true);
        copy_layer_->SetHideLayerAndSubtree(true);
        AddCopyRequest(copy_layer_.get());
        break;
      case 6:
        EndTest();
        break;
    }
  }

  virtual void AfterTest() OVERRIDE {}

  int callback_count_;
  FakeContentLayerClient client_;
  scoped_refptr<FakeContentLayer> root_;
  scoped_refptr<FakeContentLayer> grand_parent_layer_;
  scoped_refptr<FakeContentLayer> parent_layer_;
  scoped_refptr<FakeContentLayer> copy_layer_;
};

// No output to copy for delegated renderers.
SINGLE_AND_MULTI_THREAD_DIRECT_RENDERER_TEST_F(
    LayerTreeHostTestAsyncReadbackInHiddenSubtree);

class LayerTreeHostTestHiddenSurfaceNotAllocatedForSubtreeCopyRequest
    : public LayerTreeHostTest {
 protected:
  virtual void InitializeSettings(LayerTreeSettings* settings) OVERRIDE {
    settings->cache_render_pass_contents = true;
  }

  virtual void SetupTree() OVERRIDE {
    root_ = FakeContentLayer::Create(&client_);
    root_->SetBounds(gfx::Size(20, 20));

    grand_parent_layer_ = FakeContentLayer::Create(&client_);
    grand_parent_layer_->SetBounds(gfx::Size(15, 15));
    grand_parent_layer_->SetHideLayerAndSubtree(true);
    root_->AddChild(grand_parent_layer_);

    // parent_layer_ owns a render surface.
    parent_layer_ = FakeContentLayer::Create(&client_);
    parent_layer_->SetBounds(gfx::Size(15, 15));
    parent_layer_->SetForceRenderSurface(true);
    grand_parent_layer_->AddChild(parent_layer_);

    copy_layer_ = FakeContentLayer::Create(&client_);
    copy_layer_->SetBounds(gfx::Size(10, 10));
    parent_layer_->AddChild(copy_layer_);

    layer_tree_host()->SetRootLayer(root_);
    LayerTreeHostTest::SetupTree();
  }

  virtual void BeginTest() OVERRIDE {
    did_draw_ = false;
    PostSetNeedsCommitToMainThread();

    copy_layer_->RequestCopyOfOutput(
        CopyOutputRequest::CreateBitmapRequest(base::Bind(
            &LayerTreeHostTestHiddenSurfaceNotAllocatedForSubtreeCopyRequest::
                CopyOutputCallback,
            base::Unretained(this))));
  }

  void CopyOutputCallback(scoped_ptr<CopyOutputResult> result) {
    EXPECT_TRUE(layer_tree_host()->proxy()->IsMainThread());
    EXPECT_EQ(copy_layer_->bounds().ToString(), result->size().ToString());
    EndTest();
  }

  virtual void DrawLayersOnThread(LayerTreeHostImpl* host_impl) OVERRIDE {
    Renderer* renderer = host_impl->renderer();

    LayerImpl* root = host_impl->active_tree()->root_layer();
    LayerImpl* grand_parent = root->children()[0];
    LayerImpl* parent = grand_parent->children()[0];
    LayerImpl* copy_layer = parent->children()[0];

    // |parent| owns a surface, but it was hidden and not part of the copy
    // request so it should not allocate any resource.
    EXPECT_FALSE(renderer->HaveCachedResourcesForRenderPassId(
        parent->render_surface()->RenderPassId()));

    // |copy_layer| should have been rendered to a texture since it was needed
    // for a copy request.
    EXPECT_TRUE(renderer->HaveCachedResourcesForRenderPassId(
        copy_layer->render_surface()->RenderPassId()));

    did_draw_ = true;
  }

  virtual void AfterTest() OVERRIDE { EXPECT_TRUE(did_draw_); }

  FakeContentLayerClient client_;
  bool did_draw_;
  scoped_refptr<FakeContentLayer> root_;
  scoped_refptr<FakeContentLayer> grand_parent_layer_;
  scoped_refptr<FakeContentLayer> parent_layer_;
  scoped_refptr<FakeContentLayer> copy_layer_;
};

// No output to copy for delegated renderers.
SINGLE_AND_MULTI_THREAD_DIRECT_RENDERER_TEST_F(
      LayerTreeHostTestHiddenSurfaceNotAllocatedForSubtreeCopyRequest);

class LayerTreeHostTestAsyncReadbackClippedOut : public LayerTreeHostTest {
 protected:
  virtual void SetupTree() OVERRIDE {
    root_ = FakeContentLayer::Create(&client_);
    root_->SetBounds(gfx::Size(20, 20));

    parent_layer_ = FakeContentLayer::Create(&client_);
    parent_layer_->SetBounds(gfx::Size(15, 15));
    parent_layer_->SetMasksToBounds(true);
    root_->AddChild(parent_layer_);

    copy_layer_ = FakeContentLayer::Create(&client_);
    copy_layer_->SetPosition(gfx::Point(15, 15));
    copy_layer_->SetBounds(gfx::Size(10, 10));
    parent_layer_->AddChild(copy_layer_);

    layer_tree_host()->SetRootLayer(root_);
    LayerTreeHostTest::SetupTree();
  }

  virtual void BeginTest() OVERRIDE {
    PostSetNeedsCommitToMainThread();

    copy_layer_->RequestCopyOfOutput(
        CopyOutputRequest::CreateBitmapRequest(base::Bind(
            &LayerTreeHostTestAsyncReadbackClippedOut::CopyOutputCallback,
            base::Unretained(this))));
  }

  void CopyOutputCallback(scoped_ptr<CopyOutputResult> result) {
    // We should still get a callback with no output if the copy requested layer
    // was completely clipped away.
    EXPECT_TRUE(layer_tree_host()->proxy()->IsMainThread());
    EXPECT_EQ(gfx::Size().ToString(), result->size().ToString());
    EndTest();
  }

  virtual void AfterTest() OVERRIDE {}

  FakeContentLayerClient client_;
  scoped_refptr<FakeContentLayer> root_;
  scoped_refptr<FakeContentLayer> parent_layer_;
  scoped_refptr<FakeContentLayer> copy_layer_;
};

// No output to copy for delegated renderers.
SINGLE_AND_MULTI_THREAD_DIRECT_RENDERER_TEST_F(
    LayerTreeHostTestAsyncReadbackClippedOut);

class LayerTreeHostTestNumFramesPending : public LayerTreeHostTest {
 public:
  virtual void BeginTest() OVERRIDE {
    frame_ = 0;
    PostSetNeedsCommitToMainThread();
  }

  // Round 1: commit + draw
  // Round 2: commit only (no draw/swap)
  // Round 3: draw only (no commit)
  // Round 4: composite & readback (2 commits, no draw/swap)
  // Round 5: commit + draw

  virtual void DidCommit() OVERRIDE {
    int commit = layer_tree_host()->commit_number();
    switch (commit) {
      case 2:
        // Round 2 done.
        EXPECT_EQ(1, frame_);
        layer_tree_host()->SetNeedsRedraw();
        break;
      case 3:
        // CompositeAndReadback in Round 4, first commit.
        EXPECT_EQ(2, frame_);
        break;
      case 4:
        // Round 4 done.
        EXPECT_EQ(2, frame_);
        layer_tree_host()->SetNeedsCommit();
        layer_tree_host()->SetNeedsRedraw();
        break;
    }
  }

  virtual void DidCompleteSwapBuffers() OVERRIDE {
    int commit = layer_tree_host()->commit_number();
    ++frame_;
    char pixels[4] = {0};
    switch (frame_) {
      case 1:
        // Round 1 done.
        EXPECT_EQ(1, commit);
        layer_tree_host()->SetNeedsCommit();
        break;
      case 2:
        // Round 3 done.
        EXPECT_EQ(2, commit);
        layer_tree_host()->CompositeAndReadback(pixels, gfx::Rect(0, 0, 1, 1));
        break;
      case 3:
        // Round 5 done.
        EXPECT_EQ(5, commit);
        EndTest();
        break;
    }
  }

  virtual void AfterTest() OVERRIDE {}

 protected:
  int frame_;
};

TEST_F(LayerTreeHostTestNumFramesPending, DelegatingRenderer) {
  RunTest(true, true, true);
}

TEST_F(LayerTreeHostTestNumFramesPending, GLRenderer) {
  RunTest(true, false, true);
}

class LayerTreeHostTestDeferredInitialize : public LayerTreeHostTest {
 public:
  virtual void InitializeSettings(LayerTreeSettings* settings) OVERRIDE {
    // PictureLayer can only be used with impl side painting enabled.
    settings->impl_side_painting = true;
    settings->solid_color_scrollbars = true;
  }

  virtual void SetupTree() OVERRIDE {
    layer_ = FakePictureLayer::Create(&client_);
    layer_tree_host()->SetRootLayer(layer_);
    LayerTreeHostTest::SetupTree();
  }

  virtual void BeginTest() OVERRIDE {
    did_initialize_gl_ = false;
    did_release_gl_ = false;
    PostSetNeedsCommitToMainThread();
  }

  virtual scoped_ptr<OutputSurface> CreateOutputSurface() OVERRIDE {
    scoped_ptr<TestWebGraphicsContext3D> context3d(
        TestWebGraphicsContext3D::Create());
    context3d->set_support_swapbuffers_complete_callback(false);

    return FakeOutputSurface::CreateDeferredGL(
        scoped_ptr<SoftwareOutputDevice>(new SoftwareOutputDevice))
        .PassAs<OutputSurface>();
  }

  virtual void DrawLayersOnThread(LayerTreeHostImpl* host_impl) OVERRIDE {
    ASSERT_TRUE(host_impl->RootLayer());
    FakePictureLayerImpl* layer_impl =
        static_cast<FakePictureLayerImpl*>(host_impl->RootLayer());
    if (!did_initialize_gl_) {
      EXPECT_EQ(1u, layer_impl->append_quads_count());
      ImplThreadTaskRunner()->PostTask(
          FROM_HERE,
          base::Bind(
              &LayerTreeHostTestDeferredInitialize::DeferredInitializeAndRedraw,
              base::Unretained(this),
              base::Unretained(host_impl)));
    } else if (did_initialize_gl_ && !did_release_gl_) {
      EXPECT_EQ(2u, layer_impl->append_quads_count());
      ImplThreadTaskRunner()->PostTask(
          FROM_HERE,
          base::Bind(
              &LayerTreeHostTestDeferredInitialize::ReleaseGLAndRedraw,
              base::Unretained(this),
              base::Unretained(host_impl)));
    } else if (did_initialize_gl_ && did_release_gl_) {
      EXPECT_EQ(3u, layer_impl->append_quads_count());
      EndTest();
    }
  }

  void DeferredInitializeAndRedraw(LayerTreeHostImpl* host_impl) {
    EXPECT_FALSE(did_initialize_gl_);
    // SetAndInitializeContext3D calls SetNeedsCommit.
    EXPECT_TRUE(static_cast<FakeOutputSurface*>(host_impl->output_surface())
                    ->SetAndInitializeContext3D(
                          scoped_ptr<WebKit::WebGraphicsContext3D>(
                              TestWebGraphicsContext3D::Create())));
    did_initialize_gl_ = true;
  }

  void ReleaseGLAndRedraw(LayerTreeHostImpl* host_impl) {
    EXPECT_TRUE(did_initialize_gl_);
    EXPECT_FALSE(did_release_gl_);
    // ReleaseGL calls SetNeedsCommit.
    static_cast<FakeOutputSurface*>(host_impl->output_surface())->ReleaseGL();
    did_release_gl_ = true;
  }

  virtual void AfterTest() OVERRIDE {
    EXPECT_TRUE(did_initialize_gl_);
    EXPECT_TRUE(did_release_gl_);
  }

 private:
  FakeContentLayerClient client_;
  scoped_refptr<FakePictureLayer> layer_;
  bool did_initialize_gl_;
  bool did_release_gl_;
};

MULTI_THREAD_TEST_F(LayerTreeHostTestDeferredInitialize);

class PushPropertiesCountingLayer : public Layer {
 public:
  static scoped_refptr<PushPropertiesCountingLayer> Create() {
    return new PushPropertiesCountingLayer();
  }

  virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE {
    Layer::PushPropertiesTo(layer);
    push_properties_count_++;
    if (persist_needs_push_properties_)
      needs_push_properties_ = true;
  }

  size_t push_properties_count() const { return push_properties_count_; }
  void reset_push_properties_count() { push_properties_count_ = 0; }

  void set_persist_needs_push_properties(bool persist) {
    persist_needs_push_properties_ = persist;
  }

 private:
  PushPropertiesCountingLayer()
      : push_properties_count_(0),
        persist_needs_push_properties_(false) {
    SetAnchorPoint(gfx::PointF());
    SetBounds(gfx::Size(1, 1));
    SetIsDrawable(true);
  }
  virtual ~PushPropertiesCountingLayer() {}

  size_t push_properties_count_;
  bool persist_needs_push_properties_;
};

class LayerTreeHostTestLayersPushProperties : public LayerTreeHostTest {
 protected:
  virtual void BeginTest() OVERRIDE {
    num_commits_ = 0;
    expected_push_properties_root_ = 0;
    expected_push_properties_child_ = 0;
    expected_push_properties_grandchild_ = 0;
    expected_push_properties_child2_ = 0;
    expected_push_properties_other_root_ = 0;
    expected_push_properties_leaf_layer_ = 0;
    PostSetNeedsCommitToMainThread();
  }

  virtual void SetupTree() OVERRIDE {
    root_ = PushPropertiesCountingLayer::Create();
    child_ = PushPropertiesCountingLayer::Create();
    child2_ = PushPropertiesCountingLayer::Create();
    grandchild_ = PushPropertiesCountingLayer::Create();

    if (layer_tree_host()->settings().impl_side_painting)
      leaf_picture_layer_ = FakePictureLayer::Create(&client_);
    else
      leaf_content_layer_ = FakeContentLayer::Create(&client_);

    root_->AddChild(child_);
    root_->AddChild(child2_);
    child_->AddChild(grandchild_);
    if (leaf_picture_layer_)
      child2_->AddChild(leaf_picture_layer_);
    if (leaf_content_layer_)
      child2_->AddChild(leaf_content_layer_);

    other_root_ = PushPropertiesCountingLayer::Create();

    // Don't set the root layer here.
    LayerTreeHostTest::SetupTree();
  }

  virtual void DidCommitAndDrawFrame() OVERRIDE {
    ++num_commits_;

    EXPECT_EQ(expected_push_properties_root_, root_->push_properties_count());
    EXPECT_EQ(expected_push_properties_child_, child_->push_properties_count());
    EXPECT_EQ(expected_push_properties_grandchild_,
              grandchild_->push_properties_count());
    EXPECT_EQ(expected_push_properties_child2_,
              child2_->push_properties_count());
    EXPECT_EQ(expected_push_properties_other_root_,
              other_root_->push_properties_count());
    if (leaf_content_layer_) {
      EXPECT_EQ(expected_push_properties_leaf_layer_,
                leaf_content_layer_->push_properties_count());
    }
    if (leaf_picture_layer_) {
      EXPECT_EQ(expected_push_properties_leaf_layer_,
                leaf_picture_layer_->push_properties_count());
    }

    // The content/picture layer always needs to be pushed.
    if (root_->layer_tree_host()) {
      EXPECT_TRUE(root_->descendant_needs_push_properties());
      EXPECT_FALSE(root_->needs_push_properties());
    }
    if (child2_->layer_tree_host()) {
      EXPECT_TRUE(child2_->descendant_needs_push_properties());
      EXPECT_FALSE(child2_->needs_push_properties());
    }
    if (leaf_content_layer_.get() && leaf_content_layer_->layer_tree_host()) {
      EXPECT_FALSE(leaf_content_layer_->descendant_needs_push_properties());
      EXPECT_TRUE(leaf_content_layer_->needs_push_properties());
    }
    if (leaf_picture_layer_.get() && leaf_picture_layer_->layer_tree_host()) {
      EXPECT_FALSE(leaf_picture_layer_->descendant_needs_push_properties());
      EXPECT_TRUE(leaf_picture_layer_->needs_push_properties());
    }

    // child_ and grandchild_ don't persist their need to push properties.
    if (child_->layer_tree_host()) {
      EXPECT_FALSE(child_->descendant_needs_push_properties());
      EXPECT_FALSE(child_->needs_push_properties());
    }
    if (grandchild_->layer_tree_host()) {
      EXPECT_FALSE(grandchild_->descendant_needs_push_properties());
      EXPECT_FALSE(grandchild_->needs_push_properties());
    }

    if (other_root_->layer_tree_host()) {
      EXPECT_FALSE(other_root_->descendant_needs_push_properties());
      EXPECT_FALSE(other_root_->needs_push_properties());
    }

    switch (num_commits_) {
      case 1:
        layer_tree_host()->SetRootLayer(root_);
        // Layers added to the tree get committed.
        ++expected_push_properties_root_;
        ++expected_push_properties_child_;
        ++expected_push_properties_grandchild_;
        ++expected_push_properties_child2_;
        break;
      case 2:
        layer_tree_host()->SetNeedsCommit();
        // No layers need commit.
        break;
      case 3:
        layer_tree_host()->SetRootLayer(other_root_);
        // Layers added to the tree get committed.
        ++expected_push_properties_other_root_;
        break;
      case 4:
        layer_tree_host()->SetRootLayer(root_);
        // Layers added to the tree get committed.
        ++expected_push_properties_root_;
        ++expected_push_properties_child_;
        ++expected_push_properties_grandchild_;
        ++expected_push_properties_child2_;
        break;
      case 5:
        layer_tree_host()->SetNeedsCommit();
        // No layers need commit.
        break;
      case 6:
        child_->RemoveFromParent();
        // No layers need commit.
        break;
      case 7:
        root_->AddChild(child_);
        // Layers added to the tree get committed.
        ++expected_push_properties_child_;
        ++expected_push_properties_grandchild_;
        break;
      case 8:
        grandchild_->RemoveFromParent();
        // No layers need commit.
        break;
      case 9:
        child_->AddChild(grandchild_);
        // Layers added to the tree get committed.
        ++expected_push_properties_grandchild_;
        break;
      case 10:
        layer_tree_host()->SetViewportSize(gfx::Size(20, 20));
        // No layers need commit.
        break;
      case 11:
        layer_tree_host()->SetPageScaleFactorAndLimits(1.f, 0.8f, 1.1f);
        // No layers need commit.
        break;
      case 12:
        child_->SetPosition(gfx::Point(1, 1));
        // The modified layer needs commit
        ++expected_push_properties_child_;
        break;
      case 13:
        child2_->SetPosition(gfx::Point(1, 1));
        // The modified layer needs commit
        ++expected_push_properties_child2_;
        break;
      case 14:
        child_->RemoveFromParent();
        root_->AddChild(child_);
        // Layers added to the tree get committed.
        ++expected_push_properties_child_;
        ++expected_push_properties_grandchild_;
        break;
      case 15:
        grandchild_->SetPosition(gfx::Point(1, 1));
        // The modified layer needs commit
        ++expected_push_properties_grandchild_;
        break;
      case 16:
        child_->SetNeedsDisplay();
        // The modified layer needs commit
        ++expected_push_properties_child_;
        break;
      case 17:
        EndTest();
        break;
    }

    // Content/Picture layers require PushProperties every commit that they are
    // in the tree.
    if ((leaf_content_layer_.get() && leaf_content_layer_->layer_tree_host()) ||
        (leaf_picture_layer_.get() && leaf_picture_layer_->layer_tree_host()))
      ++expected_push_properties_leaf_layer_;
  }

  virtual void AfterTest() OVERRIDE {}

  int num_commits_;
  FakeContentLayerClient client_;
  scoped_refptr<PushPropertiesCountingLayer> root_;
  scoped_refptr<PushPropertiesCountingLayer> child_;
  scoped_refptr<PushPropertiesCountingLayer> child2_;
  scoped_refptr<PushPropertiesCountingLayer> grandchild_;
  scoped_refptr<PushPropertiesCountingLayer> other_root_;
  scoped_refptr<FakeContentLayer> leaf_content_layer_;
  scoped_refptr<FakePictureLayer> leaf_picture_layer_;
  size_t expected_push_properties_root_;
  size_t expected_push_properties_child_;
  size_t expected_push_properties_child2_;
  size_t expected_push_properties_grandchild_;
  size_t expected_push_properties_other_root_;
  size_t expected_push_properties_leaf_layer_;
};

MULTI_THREAD_TEST_F(LayerTreeHostTestLayersPushProperties);

class LayerTreeHostTestPropertyChangesDuringUpdateArePushed
    : public LayerTreeHostTest {
 protected:
  virtual void BeginTest() OVERRIDE {
    PostSetNeedsCommitToMainThread();
  }

  virtual void SetupTree() OVERRIDE {
    root_ = Layer::Create();
    root_->SetBounds(gfx::Size(1, 1));

    bool paint_scrollbar = true;
    bool has_thumb = false;
    scrollbar_layer_ =
        FakeScrollbarLayer::Create(paint_scrollbar, has_thumb, root_->id());

    root_->AddChild(scrollbar_layer_);

    layer_tree_host()->SetRootLayer(root_);
    LayerTreeHostTest::SetupTree();
  }

  virtual void DidCommitAndDrawFrame() OVERRIDE {
    switch (layer_tree_host()->commit_number()) {
      case 0:
        break;
      case 1: {
        // During update, the ignore_set_needs_commit_ bit is set to true to
        // avoid causing a second commit to be scheduled. If a property change
        // is made during this, however, it needs to be pushed in the upcoming
        // commit.
        scoped_ptr<base::AutoReset<bool> > ignore =
            scrollbar_layer_->IgnoreSetNeedsCommit();

        scrollbar_layer_->SetBounds(gfx::Size(30, 30));

        EXPECT_TRUE(scrollbar_layer_->needs_push_properties());
        EXPECT_TRUE(root_->descendant_needs_push_properties());
        layer_tree_host()->SetNeedsCommit();

        scrollbar_layer_->reset_push_properties_count();
        EXPECT_EQ(0u, scrollbar_layer_->push_properties_count());
        break;
      }
      case 2:
        EXPECT_EQ(1u, scrollbar_layer_->push_properties_count());
        EndTest();
        break;
    }
  }

  virtual void AfterTest() OVERRIDE {}

  scoped_refptr<Layer> root_;
  scoped_refptr<FakeScrollbarLayer> scrollbar_layer_;
};

MULTI_THREAD_TEST_F(LayerTreeHostTestPropertyChangesDuringUpdateArePushed);

class LayerTreeHostTestCasePushPropertiesThreeGrandChildren
    : public LayerTreeHostTest {
 protected:
  virtual void BeginTest() OVERRIDE {
    expected_push_properties_root_ = 0;
    expected_push_properties_child_ = 0;
    expected_push_properties_grandchild1_ = 0;
    expected_push_properties_grandchild2_ = 0;
    expected_push_properties_grandchild3_ = 0;
    PostSetNeedsCommitToMainThread();
  }

  virtual void SetupTree() OVERRIDE {
    root_ = PushPropertiesCountingLayer::Create();
    child_ = PushPropertiesCountingLayer::Create();
    grandchild1_ = PushPropertiesCountingLayer::Create();
    grandchild2_ = PushPropertiesCountingLayer::Create();
    grandchild3_ = PushPropertiesCountingLayer::Create();

    root_->AddChild(child_);
    child_->AddChild(grandchild1_);
    child_->AddChild(grandchild2_);
    child_->AddChild(grandchild3_);

    // Don't set the root layer here.
    LayerTreeHostTest::SetupTree();
  }

  virtual void AfterTest() OVERRIDE {}

  FakeContentLayerClient client_;
  scoped_refptr<PushPropertiesCountingLayer> root_;
  scoped_refptr<PushPropertiesCountingLayer> child_;
  scoped_refptr<PushPropertiesCountingLayer> grandchild1_;
  scoped_refptr<PushPropertiesCountingLayer> grandchild2_;
  scoped_refptr<PushPropertiesCountingLayer> grandchild3_;
  size_t expected_push_properties_root_;
  size_t expected_push_properties_child_;
  size_t expected_push_properties_grandchild1_;
  size_t expected_push_properties_grandchild2_;
  size_t expected_push_properties_grandchild3_;
};

class LayerTreeHostTestPushPropertiesAddingToTreeRequiresPush
    : public LayerTreeHostTestCasePushPropertiesThreeGrandChildren {
 protected:
  virtual void DidCommitAndDrawFrame() OVERRIDE {
    int last_source_frame_number = layer_tree_host()->commit_number() - 1;
    switch (last_source_frame_number) {
      case 0:
        EXPECT_FALSE(root_->needs_push_properties());
        EXPECT_FALSE(root_->descendant_needs_push_properties());
        EXPECT_FALSE(child_->needs_push_properties());
        EXPECT_FALSE(child_->descendant_needs_push_properties());
        EXPECT_FALSE(grandchild1_->needs_push_properties());
        EXPECT_FALSE(grandchild1_->descendant_needs_push_properties());
        EXPECT_FALSE(grandchild2_->needs_push_properties());
        EXPECT_FALSE(grandchild2_->descendant_needs_push_properties());
        EXPECT_FALSE(grandchild3_->needs_push_properties());
        EXPECT_FALSE(grandchild3_->descendant_needs_push_properties());

        layer_tree_host()->SetRootLayer(root_);

        EXPECT_TRUE(root_->needs_push_properties());
        EXPECT_TRUE(root_->descendant_needs_push_properties());
        EXPECT_TRUE(child_->needs_push_properties());
        EXPECT_TRUE(child_->descendant_needs_push_properties());
        EXPECT_TRUE(grandchild1_->needs_push_properties());
        EXPECT_FALSE(grandchild1_->descendant_needs_push_properties());
        EXPECT_TRUE(grandchild2_->needs_push_properties());
        EXPECT_FALSE(grandchild2_->descendant_needs_push_properties());
        EXPECT_TRUE(grandchild3_->needs_push_properties());
        EXPECT_FALSE(grandchild3_->descendant_needs_push_properties());
        break;
      case 1:
        EndTest();
        break;
    }
  }
};

MULTI_THREAD_TEST_F(LayerTreeHostTestPushPropertiesAddingToTreeRequiresPush);

class LayerTreeHostTestPushPropertiesRemovingChildStopsRecursion
    : public LayerTreeHostTestCasePushPropertiesThreeGrandChildren {
 protected:
  virtual void DidCommitAndDrawFrame() OVERRIDE {
    int last_source_frame_number = layer_tree_host()->commit_number() - 1;
    switch (last_source_frame_number) {
      case 0:
        layer_tree_host()->SetRootLayer(root_);
        break;
      case 1:
        EXPECT_FALSE(root_->needs_push_properties());
        EXPECT_FALSE(root_->descendant_needs_push_properties());
        EXPECT_FALSE(child_->needs_push_properties());
        EXPECT_FALSE(child_->descendant_needs_push_properties());
        EXPECT_FALSE(grandchild1_->needs_push_properties());
        EXPECT_FALSE(grandchild1_->descendant_needs_push_properties());
        EXPECT_FALSE(grandchild2_->needs_push_properties());
        EXPECT_FALSE(grandchild2_->descendant_needs_push_properties());
        EXPECT_FALSE(grandchild3_->needs_push_properties());
        EXPECT_FALSE(grandchild3_->descendant_needs_push_properties());

        grandchild1_->RemoveFromParent();
        grandchild1_->SetPosition(gfx::Point(1, 1));

        EXPECT_FALSE(root_->needs_push_properties());
        EXPECT_FALSE(root_->descendant_needs_push_properties());
        EXPECT_FALSE(child_->needs_push_properties());
        EXPECT_FALSE(child_->descendant_needs_push_properties());
        EXPECT_FALSE(grandchild2_->needs_push_properties());
        EXPECT_FALSE(grandchild2_->descendant_needs_push_properties());
        EXPECT_FALSE(grandchild3_->needs_push_properties());
        EXPECT_FALSE(grandchild3_->descendant_needs_push_properties());

        child_->AddChild(grandchild1_);

        EXPECT_FALSE(root_->needs_push_properties());
        EXPECT_TRUE(root_->descendant_needs_push_properties());
        EXPECT_FALSE(child_->needs_push_properties());
        EXPECT_TRUE(child_->descendant_needs_push_properties());
        EXPECT_TRUE(grandchild1_->needs_push_properties());
        EXPECT_FALSE(grandchild1_->descendant_needs_push_properties());
        EXPECT_FALSE(grandchild2_->needs_push_properties());
        EXPECT_FALSE(grandchild2_->descendant_needs_push_properties());
        EXPECT_FALSE(grandchild3_->needs_push_properties());
        EXPECT_FALSE(grandchild3_->descendant_needs_push_properties());

        grandchild2_->SetPosition(gfx::Point(1, 1));

        EXPECT_FALSE(root_->needs_push_properties());
        EXPECT_TRUE(root_->descendant_needs_push_properties());
        EXPECT_FALSE(child_->needs_push_properties());
        EXPECT_TRUE(child_->descendant_needs_push_properties());
        EXPECT_TRUE(grandchild1_->needs_push_properties());
        EXPECT_FALSE(grandchild1_->descendant_needs_push_properties());
        EXPECT_TRUE(grandchild2_->needs_push_properties());
        EXPECT_FALSE(grandchild2_->descendant_needs_push_properties());
        EXPECT_FALSE(grandchild3_->needs_push_properties());
        EXPECT_FALSE(grandchild3_->descendant_needs_push_properties());

        // grandchild2_ will still need a push properties.
        grandchild1_->RemoveFromParent();

        EXPECT_FALSE(root_->needs_push_properties());
        EXPECT_TRUE(root_->descendant_needs_push_properties());
        EXPECT_FALSE(child_->needs_push_properties());
        EXPECT_TRUE(child_->descendant_needs_push_properties());

        // grandchild3_ does not need a push properties, so recursing should
        // no longer be needed.
        grandchild2_->RemoveFromParent();

        EXPECT_FALSE(root_->needs_push_properties());
        EXPECT_FALSE(root_->descendant_needs_push_properties());
        EXPECT_FALSE(child_->needs_push_properties());
        EXPECT_FALSE(child_->descendant_needs_push_properties());
        EndTest();
        break;
    }
  }
};

MULTI_THREAD_TEST_F(LayerTreeHostTestPushPropertiesRemovingChildStopsRecursion);

class LayerTreeHostTestPushPropertiesRemovingChildStopsRecursionWithPersistence
    : public LayerTreeHostTestCasePushPropertiesThreeGrandChildren {
 protected:
  virtual void DidCommitAndDrawFrame() OVERRIDE {
    int last_source_frame_number = layer_tree_host()->commit_number() - 1;
    switch (last_source_frame_number) {
      case 0:
        layer_tree_host()->SetRootLayer(root_);
        grandchild1_->set_persist_needs_push_properties(true);
        grandchild2_->set_persist_needs_push_properties(true);
        break;
      case 1:
        EXPECT_FALSE(root_->needs_push_properties());
        EXPECT_TRUE(root_->descendant_needs_push_properties());
        EXPECT_FALSE(child_->needs_push_properties());
        EXPECT_TRUE(child_->descendant_needs_push_properties());
        EXPECT_TRUE(grandchild1_->needs_push_properties());
        EXPECT_FALSE(grandchild1_->descendant_needs_push_properties());
        EXPECT_TRUE(grandchild2_->needs_push_properties());
        EXPECT_FALSE(grandchild2_->descendant_needs_push_properties());
        EXPECT_FALSE(grandchild3_->needs_push_properties());
        EXPECT_FALSE(grandchild3_->descendant_needs_push_properties());

        // grandchild2_ will still need a push properties.
        grandchild1_->RemoveFromParent();

        EXPECT_FALSE(root_->needs_push_properties());
        EXPECT_TRUE(root_->descendant_needs_push_properties());
        EXPECT_FALSE(child_->needs_push_properties());
        EXPECT_TRUE(child_->descendant_needs_push_properties());

        // grandchild3_ does not need a push properties, so recursing should
        // no longer be needed.
        grandchild2_->RemoveFromParent();

        EXPECT_FALSE(root_->needs_push_properties());
        EXPECT_FALSE(root_->descendant_needs_push_properties());
        EXPECT_FALSE(child_->needs_push_properties());
        EXPECT_FALSE(child_->descendant_needs_push_properties());
        EndTest();
        break;
    }
  }
};

MULTI_THREAD_TEST_F(
    LayerTreeHostTestPushPropertiesRemovingChildStopsRecursionWithPersistence);

class LayerTreeHostTestPushPropertiesSetPropertiesWhileOutsideTree
    : public LayerTreeHostTestCasePushPropertiesThreeGrandChildren {
 protected:
  virtual void DidCommitAndDrawFrame() OVERRIDE {
    int last_source_frame_number = layer_tree_host()->commit_number() - 1;
    switch (last_source_frame_number) {
      case 0:
        layer_tree_host()->SetRootLayer(root_);
        break;
      case 1:
        EXPECT_FALSE(root_->needs_push_properties());
        EXPECT_FALSE(root_->descendant_needs_push_properties());
        EXPECT_FALSE(child_->needs_push_properties());
        EXPECT_FALSE(child_->descendant_needs_push_properties());
        EXPECT_FALSE(grandchild1_->needs_push_properties());
        EXPECT_FALSE(grandchild1_->descendant_needs_push_properties());
        EXPECT_FALSE(grandchild2_->needs_push_properties());
        EXPECT_FALSE(grandchild2_->descendant_needs_push_properties());
        EXPECT_FALSE(grandchild3_->needs_push_properties());
        EXPECT_FALSE(grandchild3_->descendant_needs_push_properties());

        // Change grandchildren while their parent is not in the tree.
        child_->RemoveFromParent();
        grandchild1_->SetPosition(gfx::Point(1, 1));
        grandchild2_->SetPosition(gfx::Point(1, 1));
        root_->AddChild(child_);

        EXPECT_FALSE(root_->needs_push_properties());
        EXPECT_TRUE(root_->descendant_needs_push_properties());
        EXPECT_TRUE(child_->needs_push_properties());
        EXPECT_TRUE(child_->descendant_needs_push_properties());
        EXPECT_TRUE(grandchild1_->needs_push_properties());
        EXPECT_FALSE(grandchild1_->descendant_needs_push_properties());
        EXPECT_TRUE(grandchild2_->needs_push_properties());
        EXPECT_FALSE(grandchild2_->descendant_needs_push_properties());
        EXPECT_TRUE(grandchild3_->needs_push_properties());
        EXPECT_FALSE(grandchild3_->descendant_needs_push_properties());

        grandchild1_->RemoveFromParent();

        EXPECT_FALSE(root_->needs_push_properties());
        EXPECT_TRUE(root_->descendant_needs_push_properties());
        EXPECT_TRUE(child_->needs_push_properties());
        EXPECT_TRUE(child_->descendant_needs_push_properties());

        grandchild2_->RemoveFromParent();

        EXPECT_FALSE(root_->needs_push_properties());
        EXPECT_TRUE(root_->descendant_needs_push_properties());
        EXPECT_TRUE(child_->needs_push_properties());
        EXPECT_TRUE(child_->descendant_needs_push_properties());

        grandchild3_->RemoveFromParent();

        EXPECT_FALSE(root_->needs_push_properties());
        EXPECT_TRUE(root_->descendant_needs_push_properties());
        EXPECT_TRUE(child_->needs_push_properties());
        EXPECT_FALSE(child_->descendant_needs_push_properties());

        EndTest();
        break;
    }
  }
};

MULTI_THREAD_TEST_F(
    LayerTreeHostTestPushPropertiesSetPropertiesWhileOutsideTree);

class LayerTreeHostTestPushPropertiesSetPropertyInParentThenChild
    : public LayerTreeHostTestCasePushPropertiesThreeGrandChildren {
 protected:
  virtual void DidCommitAndDrawFrame() OVERRIDE {
    int last_source_frame_number = layer_tree_host()->commit_number() - 1;
    switch (last_source_frame_number) {
      case 0:
        layer_tree_host()->SetRootLayer(root_);
        break;
      case 1:
        EXPECT_FALSE(root_->needs_push_properties());
        EXPECT_FALSE(root_->descendant_needs_push_properties());
        EXPECT_FALSE(child_->needs_push_properties());
        EXPECT_FALSE(child_->descendant_needs_push_properties());
        EXPECT_FALSE(grandchild1_->needs_push_properties());
        EXPECT_FALSE(grandchild1_->descendant_needs_push_properties());
        EXPECT_FALSE(grandchild2_->needs_push_properties());
        EXPECT_FALSE(grandchild2_->descendant_needs_push_properties());
        EXPECT_FALSE(grandchild3_->needs_push_properties());
        EXPECT_FALSE(grandchild3_->descendant_needs_push_properties());

        child_->SetPosition(gfx::Point(1, 1));
        grandchild1_->SetPosition(gfx::Point(1, 1));
        grandchild2_->SetPosition(gfx::Point(1, 1));

        EXPECT_FALSE(root_->needs_push_properties());
        EXPECT_TRUE(root_->descendant_needs_push_properties());
        EXPECT_TRUE(child_->needs_push_properties());
        EXPECT_TRUE(child_->descendant_needs_push_properties());
        EXPECT_TRUE(grandchild1_->needs_push_properties());
        EXPECT_FALSE(grandchild1_->descendant_needs_push_properties());
        EXPECT_TRUE(grandchild2_->needs_push_properties());
        EXPECT_FALSE(grandchild2_->descendant_needs_push_properties());
        EXPECT_FALSE(grandchild3_->needs_push_properties());
        EXPECT_FALSE(grandchild3_->descendant_needs_push_properties());

        grandchild1_->RemoveFromParent();

        EXPECT_FALSE(root_->needs_push_properties());
        EXPECT_TRUE(root_->descendant_needs_push_properties());
        EXPECT_TRUE(child_->needs_push_properties());
        EXPECT_TRUE(child_->descendant_needs_push_properties());

        grandchild2_->RemoveFromParent();

        EXPECT_FALSE(root_->needs_push_properties());
        EXPECT_TRUE(root_->descendant_needs_push_properties());
        EXPECT_TRUE(child_->needs_push_properties());
        EXPECT_FALSE(child_->descendant_needs_push_properties());

        child_->RemoveFromParent();

        EXPECT_FALSE(root_->needs_push_properties());
        EXPECT_FALSE(root_->descendant_needs_push_properties());

        EndTest();
        break;
    }
  }
};

MULTI_THREAD_TEST_F(
    LayerTreeHostTestPushPropertiesSetPropertyInParentThenChild);

class LayerTreeHostTestPushPropertiesSetPropertyInChildThenParent
    : public LayerTreeHostTestCasePushPropertiesThreeGrandChildren {
 protected:
  virtual void DidCommitAndDrawFrame() OVERRIDE {
    int last_source_frame_number = layer_tree_host()->commit_number() - 1;
    switch (last_source_frame_number) {
      case 0:
        layer_tree_host()->SetRootLayer(root_);
        break;
      case 1:
        EXPECT_FALSE(root_->needs_push_properties());
        EXPECT_FALSE(root_->descendant_needs_push_properties());
        EXPECT_FALSE(child_->needs_push_properties());
        EXPECT_FALSE(child_->descendant_needs_push_properties());
        EXPECT_FALSE(grandchild1_->needs_push_properties());
        EXPECT_FALSE(grandchild1_->descendant_needs_push_properties());
        EXPECT_FALSE(grandchild2_->needs_push_properties());
        EXPECT_FALSE(grandchild2_->descendant_needs_push_properties());
        EXPECT_FALSE(grandchild3_->needs_push_properties());
        EXPECT_FALSE(grandchild3_->descendant_needs_push_properties());

        grandchild1_->SetPosition(gfx::Point(1, 1));
        grandchild2_->SetPosition(gfx::Point(1, 1));
        child_->SetPosition(gfx::Point(1, 1));

        EXPECT_FALSE(root_->needs_push_properties());
        EXPECT_TRUE(root_->descendant_needs_push_properties());
        EXPECT_TRUE(child_->needs_push_properties());
        EXPECT_TRUE(child_->descendant_needs_push_properties());
        EXPECT_TRUE(grandchild1_->needs_push_properties());
        EXPECT_FALSE(grandchild1_->descendant_needs_push_properties());
        EXPECT_TRUE(grandchild2_->needs_push_properties());
        EXPECT_FALSE(grandchild2_->descendant_needs_push_properties());
        EXPECT_FALSE(grandchild3_->needs_push_properties());
        EXPECT_FALSE(grandchild3_->descendant_needs_push_properties());

        grandchild1_->RemoveFromParent();

        EXPECT_FALSE(root_->needs_push_properties());
        EXPECT_TRUE(root_->descendant_needs_push_properties());
        EXPECT_TRUE(child_->needs_push_properties());
        EXPECT_TRUE(child_->descendant_needs_push_properties());

        grandchild2_->RemoveFromParent();

        EXPECT_FALSE(root_->needs_push_properties());
        EXPECT_TRUE(root_->descendant_needs_push_properties());
        EXPECT_TRUE(child_->needs_push_properties());
        EXPECT_FALSE(child_->descendant_needs_push_properties());

        child_->RemoveFromParent();

        EXPECT_FALSE(root_->needs_push_properties());
        EXPECT_FALSE(root_->descendant_needs_push_properties());

        EndTest();
        break;
    }
  }
};

MULTI_THREAD_TEST_F(
    LayerTreeHostTestPushPropertiesSetPropertyInChildThenParent);

}  // namespace
}  // namespace cc