render_thread_impl.cc revision 23730a6e56a168d1879203e4b3819bb36e3d8f1f 
1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "content/renderer/render_thread_impl.h"
6
7#include <algorithm>
8#include <limits>
9#include <map>
10#include <vector>
11
12#include "base/allocator/allocator_extension.h"
13#include "base/command_line.h"
14#include "base/debug/trace_event.h"
15#include "base/lazy_instance.h"
16#include "base/logging.h"
17#include "base/memory/discardable_memory.h"
18#include "base/memory/shared_memory.h"
19#include "base/metrics/field_trial.h"
20#include "base/metrics/histogram.h"
21#include "base/metrics/stats_table.h"
22#include "base/path_service.h"
23#include "base/strings/string16.h"
24#include "base/strings/string_number_conversions.h"
25#include "base/strings/string_tokenizer.h"
26#include "base/strings/utf_string_conversions.h"
27#include "base/threading/thread_local.h"
28#include "base/threading/thread_restrictions.h"
29#include "base/values.h"
30#include "cc/base/switches.h"
31#include "cc/resources/raster_worker_pool.h"
32#include "content/child/appcache/appcache_dispatcher.h"
33#include "content/child/appcache/appcache_frontend_impl.h"
34#include "content/child/child_histogram_message_filter.h"
35#include "content/child/db_message_filter.h"
36#include "content/child/indexed_db/indexed_db_dispatcher.h"
37#include "content/child/indexed_db/indexed_db_message_filter.h"
38#include "content/child/npapi/npobject_util.h"
39#include "content/child/plugin_messages.h"
40#include "content/child/resource_dispatcher.h"
41#include "content/child/runtime_features.h"
42#include "content/child/thread_safe_sender.h"
43#include "content/child/web_database_observer_impl.h"
44#include "content/child/worker_task_runner.h"
45#include "content/common/child_process_messages.h"
46#include "content/common/content_constants_internal.h"
47#include "content/common/database_messages.h"
48#include "content/common/dom_storage/dom_storage_messages.h"
49#include "content/common/gpu/client/context_provider_command_buffer.h"
50#include "content/common/gpu/client/gpu_channel_host.h"
51#include "content/common/gpu/client/gpu_memory_buffer_impl.h"
52#include "content/common/gpu/gpu_messages.h"
53#include "content/common/gpu/gpu_process_launch_causes.h"
54#include "content/common/resource_messages.h"
55#include "content/common/view_messages.h"
56#include "content/common/worker_messages.h"
57#include "content/public/common/content_constants.h"
58#include "content/public/common/content_paths.h"
59#include "content/public/common/content_switches.h"
60#include "content/public/common/renderer_preferences.h"
61#include "content/public/common/url_constants.h"
62#include "content/public/renderer/content_renderer_client.h"
63#include "content/public/renderer/render_process_observer.h"
64#include "content/public/renderer/render_view_visitor.h"
65#include "content/renderer/devtools/devtools_agent_filter.h"
66#include "content/renderer/dom_storage/dom_storage_dispatcher.h"
67#include "content/renderer/dom_storage/webstoragearea_impl.h"
68#include "content/renderer/dom_storage/webstoragenamespace_impl.h"
69#include "content/renderer/gamepad_shared_memory_reader.h"
70#include "content/renderer/gpu/compositor_output_surface.h"
71#include "content/renderer/gpu/gpu_benchmarking_extension.h"
72#include "content/renderer/input/input_event_filter.h"
73#include "content/renderer/input/input_handler_manager.h"
74#include "content/renderer/media/audio_input_message_filter.h"
75#include "content/renderer/media/audio_message_filter.h"
76#include "content/renderer/media/audio_renderer_mixer_manager.h"
77#include "content/renderer/media/media_stream_center.h"
78#include "content/renderer/media/media_stream_dependency_factory.h"
79#include "content/renderer/media/midi_message_filter.h"
80#include "content/renderer/media/peer_connection_tracker.h"
81#include "content/renderer/media/renderer_gpu_video_accelerator_factories.h"
82#include "content/renderer/media/video_capture_impl_manager.h"
83#include "content/renderer/media/video_capture_message_filter.h"
84#include "content/renderer/media/webrtc_identity_service.h"
85#include "content/renderer/p2p/socket_dispatcher.h"
86#include "content/renderer/render_process_impl.h"
87#include "content/renderer/render_view_impl.h"
88#include "content/renderer/renderer_webkitplatformsupport_impl.h"
89#include "content/renderer/service_worker/embedded_worker_context_message_filter.h"
90#include "content/renderer/service_worker/embedded_worker_dispatcher.h"
91#include "content/renderer/shared_worker/embedded_shared_worker_stub.h"
92#include "grit/content_resources.h"
93#include "ipc/ipc_channel_handle.h"
94#include "ipc/ipc_forwarding_message_filter.h"
95#include "ipc/ipc_platform_file.h"
96#include "media/base/audio_hardware_config.h"
97#include "media/base/media.h"
98#include "media/filters/gpu_video_accelerator_factories.h"
99#include "net/base/net_errors.h"
100#include "net/base/net_util.h"
101#include "skia/ext/event_tracer_impl.h"
102#include "third_party/WebKit/public/platform/WebString.h"
103#include "third_party/WebKit/public/web/WebColorName.h"
104#include "third_party/WebKit/public/web/WebDatabase.h"
105#include "third_party/WebKit/public/web/WebDocument.h"
106#include "third_party/WebKit/public/web/WebFrame.h"
107#include "third_party/WebKit/public/web/WebImageCache.h"
108#include "third_party/WebKit/public/web/WebKit.h"
109#include "third_party/WebKit/public/web/WebNetworkStateNotifier.h"
110#include "third_party/WebKit/public/web/WebPopupMenu.h"
111#include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
112#include "third_party/WebKit/public/web/WebScriptController.h"
113#include "third_party/WebKit/public/web/WebSecurityPolicy.h"
114#include "third_party/WebKit/public/web/WebView.h"
115#include "third_party/skia/include/core/SkGraphics.h"
116#include "ui/base/layout.h"
117#include "ui/base/ui_base_switches.h"
118#include "v8/include/v8.h"
119#include "webkit/renderer/compositor_bindings/web_external_bitmap_impl.h"
120#include "webkit/renderer/compositor_bindings/web_layer_impl.h"
121
122#if defined(OS_ANDROID)
123#include <cpu-features.h>
124#include "content/renderer/android/synchronous_compositor_factory.h"
125#include "content/renderer/media/android/renderer_demuxer_android.h"
126#endif
127
128#if defined(OS_MACOSX)
129#include "content/renderer/webscrollbarbehavior_impl_mac.h"
130#endif
131
132#if defined(OS_POSIX)
133#include "ipc/ipc_channel_posix.h"
134#endif
135
136#if defined(OS_WIN)
137#include <windows.h>
138#include <objbase.h>
139#else
140// TODO(port)
141#include "base/memory/scoped_handle.h"
142#include "content/child/npapi/np_channel_base.h"
143#endif
144
145#if defined(ENABLE_PLUGINS)
146#include "content/renderer/npapi/plugin_channel_host.h"
147#endif
148
149#if defined(USE_MOJO)
150#include "content/renderer/mojo/mojo_render_process_observer.h"
151#endif
152
153using base::ThreadRestrictions;
154using blink::WebDocument;
155using blink::WebFrame;
156using blink::WebNetworkStateNotifier;
157using blink::WebRuntimeFeatures;
158using blink::WebScriptController;
159using blink::WebSecurityPolicy;
160using blink::WebString;
161using blink::WebView;
162
163namespace content {
164
165namespace {
166
167const int64 kInitialIdleHandlerDelayMs = 1000;
168const int64 kShortIdleHandlerDelayMs = 1000;
169const int64 kLongIdleHandlerDelayMs = 30*1000;
170const int kIdleCPUUsageThresholdInPercents = 3;
171const int kMinRasterThreads = 1;
172const int kMaxRasterThreads = 64;
173
174// Keep the global RenderThreadImpl in a TLS slot so it is impossible to access
175// incorrectly from the wrong thread.
176base::LazyInstance<base::ThreadLocalPointer<RenderThreadImpl> >
177    lazy_tls = LAZY_INSTANCE_INITIALIZER;
178
179class RenderViewZoomer : public RenderViewVisitor {
180 public:
181  RenderViewZoomer(const std::string& scheme,
182                   const std::string& host,
183                   double zoom_level) : scheme_(scheme),
184                                        host_(host),
185                                        zoom_level_(zoom_level) {
186  }
187
188  virtual bool Visit(RenderView* render_view) OVERRIDE {
189    WebView* webview = render_view->GetWebView();
190    WebDocument document = webview->mainFrame()->document();
191
192    // Don't set zoom level for full-page plugin since they don't use the same
193    // zoom settings.
194    if (document.isPluginDocument())
195      return true;
196    GURL url(document.url());
197    // Empty scheme works as wildcard that matches any scheme,
198    if ((net::GetHostOrSpecFromURL(url) == host_) &&
199        (scheme_.empty() || scheme_ == url.scheme())) {
200      webview->setZoomLevel(zoom_level_);
201    }
202    return true;
203  }
204
205 private:
206  const std::string scheme_;
207  const std::string host_;
208  const double zoom_level_;
209
210  DISALLOW_COPY_AND_ASSIGN(RenderViewZoomer);
211};
212
213std::string HostToCustomHistogramSuffix(const std::string& host) {
214  if (host == "mail.google.com")
215    return ".gmail";
216  if (host == "docs.google.com" || host == "drive.google.com")
217    return ".docs";
218  if (host == "plus.google.com")
219    return ".plus";
220  return std::string();
221}
222
223void* CreateHistogram(
224    const char *name, int min, int max, size_t buckets) {
225  if (min <= 0)
226    min = 1;
227  std::string histogram_name;
228  RenderThreadImpl* render_thread_impl = RenderThreadImpl::current();
229  if (render_thread_impl) {  // Can be null in tests.
230    histogram_name = render_thread_impl->
231        histogram_customizer()->ConvertToCustomHistogramName(name);
232  } else {
233    histogram_name = std::string(name);
234  }
235  base::HistogramBase* histogram = base::Histogram::FactoryGet(
236      histogram_name, min, max, buckets,
237      base::Histogram::kUmaTargetedHistogramFlag);
238  return histogram;
239}
240
241void AddHistogramSample(void* hist, int sample) {
242  base::Histogram* histogram = static_cast<base::Histogram*>(hist);
243  histogram->Add(sample);
244}
245
246scoped_ptr<base::SharedMemory> AllocateSharedMemoryFunction(size_t size) {
247  return RenderThreadImpl::Get()->HostAllocateSharedMemoryBuffer(size);
248}
249
250void EnableBlinkPlatformLogChannels(const std::string& channels) {
251  if (channels.empty())
252    return;
253  base::StringTokenizer t(channels, ", ");
254  while (t.GetNext())
255    blink::enableLogChannel(t.token().c_str());
256}
257
258void NotifyTimezoneChangeOnThisThread() {
259  v8::Isolate* isolate = v8::Isolate::GetCurrent();
260  if (!isolate)
261    return;
262  v8::Date::DateTimeConfigurationChangeNotification(isolate);
263}
264
265}  // namespace
266
267RenderThreadImpl::HistogramCustomizer::HistogramCustomizer() {
268  custom_histograms_.insert("V8.MemoryExternalFragmentationTotal");
269  custom_histograms_.insert("V8.MemoryHeapSampleTotalCommitted");
270  custom_histograms_.insert("V8.MemoryHeapSampleTotalUsed");
271}
272
273RenderThreadImpl::HistogramCustomizer::~HistogramCustomizer() {}
274
275void RenderThreadImpl::HistogramCustomizer::RenderViewNavigatedToHost(
276    const std::string& host, size_t view_count) {
277  if (CommandLine::ForCurrentProcess()->HasSwitch(
278      switches::kDisableHistogramCustomizer)) {
279    return;
280  }
281  // Check if all RenderViews are displaying a page from the same host. If there
282  // is only one RenderView, the common host is this view's host. If there are
283  // many, check if this one shares the common host of the other
284  // RenderViews. It's ok to not detect some cases where the RenderViews share a
285  // common host. This information is only used for producing custom histograms.
286  if (view_count == 1)
287    SetCommonHost(host);
288  else if (host != common_host_)
289    SetCommonHost(std::string());
290}
291
292std::string RenderThreadImpl::HistogramCustomizer::ConvertToCustomHistogramName(
293    const char* histogram_name) const {
294  std::string name(histogram_name);
295  if (!common_host_histogram_suffix_.empty() &&
296      custom_histograms_.find(name) != custom_histograms_.end())
297    name += common_host_histogram_suffix_;
298  return name;
299}
300
301void RenderThreadImpl::HistogramCustomizer::SetCommonHost(
302    const std::string& host) {
303  if (host != common_host_) {
304    common_host_ = host;
305    common_host_histogram_suffix_ = HostToCustomHistogramSuffix(host);
306    v8::V8::SetCreateHistogramFunction(CreateHistogram);
307  }
308}
309
310RenderThreadImpl* RenderThreadImpl::current() {
311  return lazy_tls.Pointer()->Get();
312}
313
314// When we run plugins in process, we actually run them on the render thread,
315// which means that we need to make the render thread pump UI events.
316RenderThreadImpl::RenderThreadImpl() {
317  Init();
318}
319
320RenderThreadImpl::RenderThreadImpl(const std::string& channel_name)
321    : ChildThread(channel_name) {
322  Init();
323}
324
325void RenderThreadImpl::Init() {
326  TRACE_EVENT_BEGIN_ETW("RenderThreadImpl::Init", 0, "");
327
328  base::debug::TraceLog::GetInstance()->SetThreadSortIndex(
329      base::PlatformThread::CurrentId(),
330      kTraceEventRendererMainThreadSortIndex);
331
332  v8::V8::SetCounterFunction(base::StatsTable::FindLocation);
333  v8::V8::SetCreateHistogramFunction(CreateHistogram);
334  v8::V8::SetAddHistogramSampleFunction(AddHistogramSample);
335
336#if defined(OS_MACOSX) || defined(OS_ANDROID)
337  // On Mac and Android, the select popups are rendered by the browser.
338  blink::WebView::setUseExternalPopupMenus(true);
339#endif
340
341  lazy_tls.Pointer()->Set(this);
342
343  // Register this object as the main thread.
344  ChildProcess::current()->set_main_thread(this);
345
346  // In single process the single process is all there is.
347  suspend_webkit_shared_timer_ = true;
348  notify_webkit_of_modal_loop_ = true;
349  webkit_shared_timer_suspended_ = false;
350  widget_count_ = 0;
351  hidden_widget_count_ = 0;
352  idle_notification_delay_in_ms_ = kInitialIdleHandlerDelayMs;
353  idle_notifications_to_skip_ = 0;
354  layout_test_mode_ = false;
355
356  appcache_dispatcher_.reset(
357      new AppCacheDispatcher(Get(), new AppCacheFrontendImpl()));
358  dom_storage_dispatcher_.reset(new DomStorageDispatcher());
359  main_thread_indexed_db_dispatcher_.reset(new IndexedDBDispatcher(
360      thread_safe_sender()));
361  embedded_worker_dispatcher_.reset(new EmbeddedWorkerDispatcher());
362
363  media_stream_center_ = NULL;
364
365  db_message_filter_ = new DBMessageFilter();
366  AddFilter(db_message_filter_.get());
367
368  vc_manager_.reset(new VideoCaptureImplManager());
369  AddFilter(vc_manager_->video_capture_message_filter());
370
371#if defined(ENABLE_WEBRTC)
372  peer_connection_tracker_.reset(new PeerConnectionTracker());
373  AddObserver(peer_connection_tracker_.get());
374
375  p2p_socket_dispatcher_ =
376      new P2PSocketDispatcher(GetIOMessageLoopProxy().get());
377  AddFilter(p2p_socket_dispatcher_.get());
378
379  webrtc_identity_service_.reset(new WebRTCIdentityService());
380
381  media_stream_factory_.reset(new MediaStreamDependencyFactory(
382      p2p_socket_dispatcher_.get()));
383  AddObserver(media_stream_factory_.get());
384#endif  // defined(ENABLE_WEBRTC)
385
386  audio_input_message_filter_ =
387      new AudioInputMessageFilter(GetIOMessageLoopProxy());
388  AddFilter(audio_input_message_filter_.get());
389
390  audio_message_filter_ = new AudioMessageFilter(GetIOMessageLoopProxy());
391  AddFilter(audio_message_filter_.get());
392
393  midi_message_filter_ = new MidiMessageFilter(GetIOMessageLoopProxy());
394  AddFilter(midi_message_filter_.get());
395
396  AddFilter((new IndexedDBMessageFilter(thread_safe_sender()))->GetFilter());
397
398  AddFilter((new EmbeddedWorkerContextMessageFilter())->GetFilter());
399
400#if defined(USE_MOJO)
401  // MojoRenderProcessObserver deletes itself as necessary.
402  new MojoRenderProcessObserver(this);
403#endif
404
405  GetContentClient()->renderer()->RenderThreadStarted();
406
407  InitSkiaEventTracer();
408
409  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
410  if (command_line.HasSwitch(cc::switches::kEnableGpuBenchmarking))
411      RegisterExtension(GpuBenchmarkingExtension::Get());
412
413  is_impl_side_painting_enabled_ =
414      command_line.HasSwitch(switches::kEnableImplSidePainting) &&
415      !command_line.HasSwitch(switches::kDisableImplSidePainting);
416  webkit::WebLayerImpl::SetImplSidePaintingEnabled(
417      is_impl_side_painting_enabled_);
418
419  is_map_image_enabled_ =
420      command_line.HasSwitch(switches::kEnableMapImage) &&
421      !command_line.HasSwitch(switches::kDisableMapImage);
422
423  if (command_line.HasSwitch(switches::kDisableLCDText)) {
424    is_lcd_text_enabled_ = false;
425  } else if (command_line.HasSwitch(switches::kEnableLCDText)) {
426    is_lcd_text_enabled_ = true;
427  } else {
428#if defined(OS_ANDROID)
429    is_lcd_text_enabled_ = false;
430#else
431    is_lcd_text_enabled_ = true;
432#endif
433  }
434
435  is_gpu_rasterization_enabled_ = false;
436  is_gpu_rasterization_forced_ = false;
437  if (is_impl_side_painting_enabled_ &&
438      !command_line.HasSwitch(switches::kDisableGpuRasterization)) {
439    if (command_line.HasSwitch(switches::kForceGpuRasterization)) {
440      is_gpu_rasterization_forced_ = true;
441    } else if (command_line.HasSwitch(switches::kEnableGpuRasterization) ||
442               command_line.HasSwitch(
443                   switches::kEnableBleedingEdgeRenderingFastPaths)) {
444      is_gpu_rasterization_enabled_ = true;
445    }
446  }
447
448  is_low_res_tiling_enabled_ = !is_gpu_rasterization_enabled_;
449  if (command_line.HasSwitch(switches::kDisableLowResTiling) &&
450      !command_line.HasSwitch(switches::kEnableLowResTiling)) {
451    is_low_res_tiling_enabled_ = false;
452  }
453
454  // Note that under Linux, the media library will normally already have
455  // been initialized by the Zygote before this instance became a Renderer.
456  base::FilePath media_path;
457  PathService::Get(DIR_MEDIA_LIBS, &media_path);
458  if (!media_path.empty())
459    media::InitializeMediaLibrary(media_path);
460
461  memory_pressure_listener_.reset(new base::MemoryPressureListener(
462      base::Bind(&RenderThreadImpl::OnMemoryPressure, base::Unretained(this))));
463
464  std::vector<base::DiscardableMemoryType> supported_types;
465  base::DiscardableMemory::GetSupportedTypes(&supported_types);
466  DCHECK(!supported_types.empty());
467
468  // The default preferred type is always the first one in list.
469  base::DiscardableMemoryType type = supported_types[0];
470
471  if (command_line.HasSwitch(switches::kUseDiscardableMemory)) {
472    std::string requested_type_name = command_line.GetSwitchValueASCII(
473        switches::kUseDiscardableMemory);
474    base::DiscardableMemoryType requested_type =
475        base::DiscardableMemory::GetNamedType(requested_type_name);
476    if (std::find(supported_types.begin(),
477                  supported_types.end(),
478                  requested_type) != supported_types.end()) {
479      type = requested_type;
480    } else {
481      LOG(ERROR) << "Requested discardable memory type is not supported.";
482    }
483  }
484
485  base::DiscardableMemory::SetPreferredType(type);
486
487  // Allow discardable memory implementations to register memory pressure
488  // listeners.
489  base::DiscardableMemory::RegisterMemoryPressureListeners();
490
491  // AllocateGpuMemoryBuffer must be used exclusively on one thread but
492  // it doesn't have to be the same thread RenderThreadImpl is created on.
493  allocate_gpu_memory_buffer_thread_checker_.DetachFromThread();
494
495  if (command_line.HasSwitch(switches::kNumRasterThreads)) {
496    int num_raster_threads;
497    std::string string_value =
498        command_line.GetSwitchValueASCII(switches::kNumRasterThreads);
499    if (base::StringToInt(string_value, &num_raster_threads) &&
500        num_raster_threads >= kMinRasterThreads &&
501        num_raster_threads <= kMaxRasterThreads) {
502      cc::RasterWorkerPool::SetNumRasterThreads(num_raster_threads);
503    } else {
504      LOG(WARNING) << "Failed to parse switch " <<
505                      switches::kNumRasterThreads  << ": " << string_value;
506    }
507  }
508
509  TRACE_EVENT_END_ETW("RenderThreadImpl::Init", 0, "");
510}
511
512RenderThreadImpl::~RenderThreadImpl() {
513}
514
515void RenderThreadImpl::Shutdown() {
516  FOR_EACH_OBSERVER(
517      RenderProcessObserver, observers_, OnRenderProcessShutdown());
518
519  ChildThread::Shutdown();
520
521  // Wait for all databases to be closed.
522  if (webkit_platform_support_) {
523    webkit_platform_support_->web_database_observer_impl()->
524        WaitForAllDatabasesToClose();
525  }
526
527  // Shutdown in reverse of the initialization order.
528  if (devtools_agent_message_filter_.get()) {
529    RemoveFilter(devtools_agent_message_filter_.get());
530    devtools_agent_message_filter_ = NULL;
531  }
532
533  RemoveFilter(audio_input_message_filter_.get());
534  audio_input_message_filter_ = NULL;
535
536  RemoveFilter(audio_message_filter_.get());
537  audio_message_filter_ = NULL;
538
539  // |media_stream_factory_| produces users of |vc_manager_| so it must be
540  // destroyed first.
541#if defined(ENABLE_WEBRTC)
542  media_stream_factory_.reset();
543#endif
544  RemoveFilter(vc_manager_->video_capture_message_filter());
545  vc_manager_.reset();
546
547  RemoveFilter(db_message_filter_.get());
548  db_message_filter_ = NULL;
549
550  // Shutdown the file thread if it's running.
551  if (file_thread_)
552    file_thread_->Stop();
553
554  if (compositor_output_surface_filter_.get()) {
555    RemoveFilter(compositor_output_surface_filter_.get());
556    compositor_output_surface_filter_ = NULL;
557  }
558
559  media_thread_.reset();
560  compositor_thread_.reset();
561  input_handler_manager_.reset();
562  if (input_event_filter_.get()) {
563    RemoveFilter(input_event_filter_.get());
564    input_event_filter_ = NULL;
565  }
566
567  // Ramp down IDB before we ramp down WebKit (and V8), since IDB classes might
568  // hold pointers to V8 objects (e.g., via pending requests).
569  main_thread_indexed_db_dispatcher_.reset();
570
571  if (webkit_platform_support_)
572    blink::shutdown();
573
574  lazy_tls.Pointer()->Set(NULL);
575
576  // TODO(port)
577#if defined(OS_WIN)
578  // Clean up plugin channels before this thread goes away.
579  NPChannelBase::CleanupChannels();
580#endif
581
582  // Leak shared contexts on other threads, as we can not get to the correct
583  // thread to destroy them.
584  if (offscreen_compositor_contexts_.get())
585    offscreen_compositor_contexts_->set_leak_on_destroy();
586}
587
588bool RenderThreadImpl::Send(IPC::Message* msg) {
589  // Certain synchronous messages cannot always be processed synchronously by
590  // the browser, e.g., putting up UI and waiting for the user. This could cause
591  // a complete hang of Chrome if a windowed plug-in is trying to communicate
592  // with the renderer thread since the browser's UI thread could be stuck
593  // (within a Windows API call) trying to synchronously communicate with the
594  // plug-in.  The remedy is to pump messages on this thread while the browser
595  // is processing this request. This creates an opportunity for re-entrancy
596  // into WebKit, so we need to take care to disable callbacks, timers, and
597  // pending network loads that could trigger such callbacks.
598  bool pumping_events = false;
599  if (msg->is_sync()) {
600    if (msg->is_caller_pumping_messages()) {
601      pumping_events = true;
602    }
603  }
604
605  bool suspend_webkit_shared_timer = true;  // default value
606  std::swap(suspend_webkit_shared_timer, suspend_webkit_shared_timer_);
607
608  bool notify_webkit_of_modal_loop = true;  // default value
609  std::swap(notify_webkit_of_modal_loop, notify_webkit_of_modal_loop_);
610
611#if defined(ENABLE_PLUGINS)
612  int render_view_id = MSG_ROUTING_NONE;
613#endif
614
615  if (pumping_events) {
616    if (suspend_webkit_shared_timer)
617      webkit_platform_support_->SuspendSharedTimer();
618
619    if (notify_webkit_of_modal_loop)
620      WebView::willEnterModalLoop();
621#if defined(ENABLE_PLUGINS)
622    RenderViewImpl* render_view =
623        RenderViewImpl::FromRoutingID(msg->routing_id());
624    if (render_view) {
625      render_view_id = msg->routing_id();
626      PluginChannelHost::Broadcast(
627          new PluginMsg_SignalModalDialogEvent(render_view_id));
628    }
629#endif
630  }
631
632  bool rv = ChildThread::Send(msg);
633
634  if (pumping_events) {
635#if defined(ENABLE_PLUGINS)
636    if (render_view_id != MSG_ROUTING_NONE) {
637      PluginChannelHost::Broadcast(
638          new PluginMsg_ResetModalDialogEvent(render_view_id));
639    }
640#endif
641
642    if (notify_webkit_of_modal_loop)
643      WebView::didExitModalLoop();
644
645    if (suspend_webkit_shared_timer)
646      webkit_platform_support_->ResumeSharedTimer();
647  }
648
649  return rv;
650}
651
652base::MessageLoop* RenderThreadImpl::GetMessageLoop() {
653  return message_loop();
654}
655
656IPC::SyncChannel* RenderThreadImpl::GetChannel() {
657  return channel();
658}
659
660std::string RenderThreadImpl::GetLocale() {
661  // The browser process should have passed the locale to the renderer via the
662  // --lang command line flag.
663  const CommandLine& parsed_command_line = *CommandLine::ForCurrentProcess();
664  const std::string& lang =
665      parsed_command_line.GetSwitchValueASCII(switches::kLang);
666  DCHECK(!lang.empty());
667  return lang;
668}
669
670IPC::SyncMessageFilter* RenderThreadImpl::GetSyncMessageFilter() {
671  return sync_message_filter();
672}
673
674scoped_refptr<base::MessageLoopProxy>
675    RenderThreadImpl::GetIOMessageLoopProxy() {
676  return ChildProcess::current()->io_message_loop_proxy();
677}
678
679void RenderThreadImpl::AddRoute(int32 routing_id, IPC::Listener* listener) {
680  ChildThread::GetRouter()->AddRoute(routing_id, listener);
681}
682
683void RenderThreadImpl::RemoveRoute(int32 routing_id) {
684  ChildThread::GetRouter()->RemoveRoute(routing_id);
685}
686
687void RenderThreadImpl::AddSharedWorkerRoute(int32 routing_id,
688                                            IPC::Listener* listener) {
689  AddRoute(routing_id, listener);
690  if (devtools_agent_message_filter_.get()) {
691    devtools_agent_message_filter_->AddSharedWorkerRouteOnMainThread(
692        routing_id);
693  }
694}
695
696void RenderThreadImpl::RemoveSharedWorkerRoute(int32 routing_id) {
697  RemoveRoute(routing_id);
698  if (devtools_agent_message_filter_.get()) {
699    devtools_agent_message_filter_->RemoveSharedWorkerRouteOnMainThread(
700        routing_id);
701  }
702}
703
704int RenderThreadImpl::GenerateRoutingID() {
705  int routing_id = MSG_ROUTING_NONE;
706  Send(new ViewHostMsg_GenerateRoutingID(&routing_id));
707  return routing_id;
708}
709
710void RenderThreadImpl::AddFilter(IPC::ChannelProxy::MessageFilter* filter) {
711  channel()->AddFilter(filter);
712}
713
714void RenderThreadImpl::RemoveFilter(IPC::ChannelProxy::MessageFilter* filter) {
715  channel()->RemoveFilter(filter);
716}
717
718void RenderThreadImpl::AddObserver(RenderProcessObserver* observer) {
719  observers_.AddObserver(observer);
720}
721
722void RenderThreadImpl::RemoveObserver(RenderProcessObserver* observer) {
723  observers_.RemoveObserver(observer);
724}
725
726void RenderThreadImpl::SetResourceDispatcherDelegate(
727    ResourceDispatcherDelegate* delegate) {
728  resource_dispatcher()->set_delegate(delegate);
729}
730
731void RenderThreadImpl::EnsureWebKitInitialized() {
732  if (webkit_platform_support_)
733    return;
734
735  webkit_platform_support_.reset(new RendererWebKitPlatformSupportImpl);
736  blink::initialize(webkit_platform_support_.get());
737
738  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
739
740  bool enable = command_line.HasSwitch(switches::kEnableThreadedCompositing);
741  if (enable) {
742#if defined(OS_ANDROID)
743    if (SynchronousCompositorFactory* factory =
744        SynchronousCompositorFactory::GetInstance())
745      compositor_message_loop_proxy_ =
746          factory->GetCompositorMessageLoop();
747#endif
748    if (!compositor_message_loop_proxy_.get()) {
749      compositor_thread_.reset(new base::Thread("Compositor"));
750      compositor_thread_->Start();
751#if defined(OS_ANDROID)
752      compositor_thread_->SetPriority(base::kThreadPriority_Display);
753#endif
754      compositor_message_loop_proxy_ =
755          compositor_thread_->message_loop_proxy();
756      compositor_message_loop_proxy_->PostTask(
757          FROM_HERE,
758          base::Bind(base::IgnoreResult(&ThreadRestrictions::SetIOAllowed),
759                     false));
760    }
761
762    InputHandlerManagerClient* input_handler_manager_client = NULL;
763#if defined(OS_ANDROID)
764    if (SynchronousCompositorFactory* factory =
765        SynchronousCompositorFactory::GetInstance()) {
766      input_handler_manager_client = factory->GetInputHandlerManagerClient();
767    }
768#endif
769    if (!input_handler_manager_client) {
770      input_event_filter_ =
771          new InputEventFilter(this, compositor_message_loop_proxy_);
772      AddFilter(input_event_filter_.get());
773      input_handler_manager_client = input_event_filter_.get();
774    }
775    input_handler_manager_.reset(
776        new InputHandlerManager(compositor_message_loop_proxy_,
777                                input_handler_manager_client));
778  }
779
780  scoped_refptr<base::MessageLoopProxy> output_surface_loop;
781  if (enable)
782    output_surface_loop = compositor_message_loop_proxy_;
783  else
784    output_surface_loop = base::MessageLoopProxy::current();
785
786  compositor_output_surface_filter_ =
787      CompositorOutputSurface::CreateFilter(output_surface_loop.get());
788  AddFilter(compositor_output_surface_filter_.get());
789
790  RenderThreadImpl::RegisterSchemes();
791
792  EnableBlinkPlatformLogChannels(
793      command_line.GetSwitchValueASCII(switches::kBlinkPlatformLogChannels));
794
795  SetRuntimeFeaturesDefaultsAndUpdateFromArgs(command_line);
796
797  if (!media::IsMediaLibraryInitialized()) {
798    WebRuntimeFeatures::enableMediaPlayer(false);
799    WebRuntimeFeatures::enableWebAudio(false);
800  }
801
802  FOR_EACH_OBSERVER(RenderProcessObserver, observers_, WebKitInitialized());
803
804  devtools_agent_message_filter_ = new DevToolsAgentFilter();
805  AddFilter(devtools_agent_message_filter_.get());
806
807  if (GetContentClient()->renderer()->RunIdleHandlerWhenWidgetsHidden())
808    ScheduleIdleHandler(kLongIdleHandlerDelayMs);
809
810  webkit::SetSharedMemoryAllocationFunction(AllocateSharedMemoryFunction);
811
812  // Limit use of the scaled image cache to when deferred image decoding
813  // is enabled.
814  // TODO(reveman): Allow use of this cache on Android once
815  // SkDiscardablePixelRef is used for decoded images. crbug.com/330041
816  bool use_skia_scaled_image_cache = false;
817#if !defined(OS_ANDROID)
818  use_skia_scaled_image_cache =
819      command_line.HasSwitch(switches::kEnableDeferredImageDecoding) ||
820      is_impl_side_painting_enabled_;
821#endif
822  if (!use_skia_scaled_image_cache)
823    SkGraphics::SetImageCacheByteLimit(0u);
824}
825
826void RenderThreadImpl::RegisterSchemes() {
827  // swappedout: pages should not be accessible, and should also
828  // be treated as empty documents that can commit synchronously.
829  WebString swappedout_scheme(base::ASCIIToUTF16(kSwappedOutScheme));
830  WebSecurityPolicy::registerURLSchemeAsDisplayIsolated(swappedout_scheme);
831  WebSecurityPolicy::registerURLSchemeAsEmptyDocument(swappedout_scheme);
832}
833
834void RenderThreadImpl::NotifyTimezoneChange() {
835  NotifyTimezoneChangeOnThisThread();
836  RenderThread::Get()->PostTaskToAllWebWorkers(
837      base::Bind(&NotifyTimezoneChangeOnThisThread));
838}
839
840void RenderThreadImpl::RecordAction(const base::UserMetricsAction& action) {
841  Send(new ViewHostMsg_UserMetricsRecordAction(action.str_));
842}
843
844void RenderThreadImpl::RecordComputedAction(const std::string& action) {
845  Send(new ViewHostMsg_UserMetricsRecordAction(action));
846}
847
848scoped_ptr<base::SharedMemory>
849    RenderThreadImpl::HostAllocateSharedMemoryBuffer(size_t size) {
850  if (size > static_cast<size_t>(std::numeric_limits<int>::max()))
851    return scoped_ptr<base::SharedMemory>();
852
853  base::SharedMemoryHandle handle;
854  bool success;
855  IPC::Message* message =
856      new ChildProcessHostMsg_SyncAllocateSharedMemory(size, &handle);
857
858  // Allow calling this from the compositor thread.
859  if (base::MessageLoop::current() == message_loop())
860    success = ChildThread::Send(message);
861  else
862    success = sync_message_filter()->Send(message);
863
864  if (!success)
865    return scoped_ptr<base::SharedMemory>();
866
867  if (!base::SharedMemory::IsHandleValid(handle))
868    return scoped_ptr<base::SharedMemory>();
869
870  return scoped_ptr<base::SharedMemory>(new base::SharedMemory(handle, false));
871}
872
873void RenderThreadImpl::RegisterExtension(v8::Extension* extension) {
874  WebScriptController::registerExtension(extension);
875}
876
877void RenderThreadImpl::ScheduleIdleHandler(int64 initial_delay_ms) {
878  idle_notification_delay_in_ms_ = initial_delay_ms;
879  idle_timer_.Stop();
880  idle_timer_.Start(FROM_HERE,
881      base::TimeDelta::FromMilliseconds(initial_delay_ms),
882      this, &RenderThreadImpl::IdleHandler);
883}
884
885void RenderThreadImpl::IdleHandler() {
886  bool run_in_foreground_tab = (widget_count_ > hidden_widget_count_) &&
887                               GetContentClient()->renderer()->
888                                   RunIdleHandlerWhenWidgetsHidden();
889  if (run_in_foreground_tab) {
890    IdleHandlerInForegroundTab();
891    return;
892  }
893
894  base::allocator::ReleaseFreeMemory();
895
896  // Continue the idle timer if the webkit shared timer is not suspended or
897  // something is left to do.
898  bool continue_timer = !webkit_shared_timer_suspended_;
899
900  if (!v8::V8::IdleNotification()) {
901    continue_timer = true;
902  }
903
904  // Schedule next invocation.
905  // Dampen the delay using the algorithm (if delay is in seconds):
906  //    delay = delay + 1 / (delay + 2)
907  // Using floor(delay) has a dampening effect such as:
908  //    1s, 1, 1, 2, 2, 2, 2, 3, 3, ...
909  // If the delay is in milliseconds, the above formula is equivalent to:
910  //    delay_ms / 1000 = delay_ms / 1000 + 1 / (delay_ms / 1000 + 2)
911  // which is equivalent to
912  //    delay_ms = delay_ms + 1000*1000 / (delay_ms + 2000).
913  // Note that idle_notification_delay_in_ms_ would be reset to
914  // kInitialIdleHandlerDelayMs in RenderThreadImpl::WidgetHidden.
915  if (continue_timer) {
916    ScheduleIdleHandler(idle_notification_delay_in_ms_ +
917                        1000000 / (idle_notification_delay_in_ms_ + 2000));
918
919  } else {
920    idle_timer_.Stop();
921  }
922
923  FOR_EACH_OBSERVER(RenderProcessObserver, observers_, IdleNotification());
924}
925
926void RenderThreadImpl::IdleHandlerInForegroundTab() {
927  // Increase the delay in the same way as in IdleHandler,
928  // but make it periodic by reseting it once it is too big.
929  int64 new_delay_ms = idle_notification_delay_in_ms_ +
930                       1000000 / (idle_notification_delay_in_ms_ + 2000);
931  if (new_delay_ms >= kLongIdleHandlerDelayMs)
932    new_delay_ms = kShortIdleHandlerDelayMs;
933
934  if (idle_notifications_to_skip_ > 0) {
935    idle_notifications_to_skip_--;
936  } else  {
937    int cpu_usage = 0;
938    Send(new ViewHostMsg_GetCPUUsage(&cpu_usage));
939    // Idle notification hint roughly specifies the expected duration of the
940    // idle pause. We set it proportional to the idle timer delay.
941    int idle_hint = static_cast<int>(new_delay_ms / 10);
942    if (cpu_usage < kIdleCPUUsageThresholdInPercents) {
943      base::allocator::ReleaseFreeMemory();
944      if (v8::V8::IdleNotification(idle_hint)) {
945        // V8 finished collecting garbage.
946        new_delay_ms = kLongIdleHandlerDelayMs;
947      }
948    }
949  }
950  ScheduleIdleHandler(new_delay_ms);
951}
952
953int64 RenderThreadImpl::GetIdleNotificationDelayInMs() const {
954  return idle_notification_delay_in_ms_;
955}
956
957void RenderThreadImpl::SetIdleNotificationDelayInMs(
958    int64 idle_notification_delay_in_ms) {
959  idle_notification_delay_in_ms_ = idle_notification_delay_in_ms;
960}
961
962void RenderThreadImpl::UpdateHistograms(int sequence_number) {
963  child_histogram_message_filter()->SendHistograms(sequence_number);
964}
965
966int RenderThreadImpl::PostTaskToAllWebWorkers(const base::Closure& closure) {
967  return WorkerTaskRunner::Instance()->PostTaskToAllThreads(closure);
968}
969
970bool RenderThreadImpl::ResolveProxy(const GURL& url, std::string* proxy_list) {
971  bool result = false;
972  Send(new ViewHostMsg_ResolveProxy(url, &result, proxy_list));
973  return result;
974}
975
976void RenderThreadImpl::PostponeIdleNotification() {
977  idle_notifications_to_skip_ = 2;
978}
979
980scoped_refptr<media::GpuVideoAcceleratorFactories>
981RenderThreadImpl::GetGpuFactories() {
982  DCHECK(IsMainThread());
983
984  scoped_refptr<GpuChannelHost> gpu_channel_host = GetGpuChannel();
985  const CommandLine* cmd_line = CommandLine::ForCurrentProcess();
986  scoped_refptr<media::GpuVideoAcceleratorFactories> gpu_factories;
987  scoped_refptr<base::MessageLoopProxy> media_loop_proxy =
988      GetMediaThreadMessageLoopProxy();
989  if (!cmd_line->HasSwitch(switches::kDisableAcceleratedVideoDecode)) {
990    if (!gpu_va_context_provider_ ||
991        gpu_va_context_provider_->DestroyedOnMainThread()) {
992      if (!gpu_channel_host) {
993        gpu_channel_host = EstablishGpuChannelSync(
994            CAUSE_FOR_GPU_LAUNCH_WEBGRAPHICSCONTEXT3DCOMMANDBUFFERIMPL_INITIALIZE);
995      }
996      gpu_va_context_provider_ = ContextProviderCommandBuffer::Create(
997          make_scoped_ptr(
998              WebGraphicsContext3DCommandBufferImpl::CreateOffscreenContext(
999                  gpu_channel_host.get(),
1000                  blink::WebGraphicsContext3D::Attributes(),
1001                  GURL("chrome://gpu/RenderThreadImpl::GetGpuVDAContext3D"),
1002                  WebGraphicsContext3DCommandBufferImpl::SharedMemoryLimits(),
1003                  NULL)),
1004          "GPU-VideoAccelerator-Offscreen");
1005    }
1006  }
1007  if (gpu_va_context_provider_) {
1008    gpu_factories = RendererGpuVideoAcceleratorFactories::Create(
1009        gpu_channel_host, media_loop_proxy, gpu_va_context_provider_);
1010  }
1011  return gpu_factories;
1012}
1013
1014scoped_ptr<WebGraphicsContext3DCommandBufferImpl>
1015RenderThreadImpl::CreateOffscreenContext3d() {
1016  blink::WebGraphicsContext3D::Attributes attributes;
1017  attributes.shareResources = true;
1018  attributes.depth = false;
1019  attributes.stencil = false;
1020  attributes.antialias = false;
1021  attributes.noAutomaticFlushes = true;
1022
1023  scoped_refptr<GpuChannelHost> gpu_channel_host(EstablishGpuChannelSync(
1024      CAUSE_FOR_GPU_LAUNCH_WEBGRAPHICSCONTEXT3DCOMMANDBUFFERIMPL_INITIALIZE));
1025  return make_scoped_ptr(
1026      WebGraphicsContext3DCommandBufferImpl::CreateOffscreenContext(
1027          gpu_channel_host.get(),
1028          attributes,
1029          GURL("chrome://gpu/RenderThreadImpl::CreateOffscreenContext3d"),
1030          WebGraphicsContext3DCommandBufferImpl::SharedMemoryLimits(),
1031          NULL));
1032}
1033
1034scoped_refptr<cc::ContextProvider>
1035RenderThreadImpl::OffscreenCompositorContextProvider() {
1036  DCHECK(IsMainThread());
1037
1038#if defined(OS_ANDROID)
1039  if (SynchronousCompositorFactory* factory =
1040      SynchronousCompositorFactory::GetInstance()) {
1041    if (compositor_message_loop_proxy_)
1042      return factory->GetOffscreenContextProviderForCompositorThread();
1043    return factory->GetOffscreenContextProviderForMainThread();
1044  }
1045#endif
1046
1047  if (!offscreen_compositor_contexts_.get() ||
1048      offscreen_compositor_contexts_->DestroyedOnMainThread()) {
1049    offscreen_compositor_contexts_ = ContextProviderCommandBuffer::Create(
1050        CreateOffscreenContext3d(),
1051        "Compositor-Offscreen");
1052  }
1053  return offscreen_compositor_contexts_;
1054}
1055
1056scoped_refptr<webkit::gpu::ContextProviderWebContext>
1057RenderThreadImpl::SharedMainThreadContextProvider() {
1058  DCHECK(IsMainThread());
1059#if defined(OS_ANDROID)
1060  if (SynchronousCompositorFactory* factory =
1061      SynchronousCompositorFactory::GetInstance())
1062    return factory->GetOffscreenContextProviderForMainThread();
1063#endif
1064
1065  if (!shared_main_thread_contexts_ ||
1066      shared_main_thread_contexts_->DestroyedOnMainThread()) {
1067    if (compositor_message_loop_proxy_) {
1068      // In threaded compositing mode, we have to create a new ContextProvider
1069      // to bind to the main thread since the compositor's is bound to the
1070      // compositor thread.
1071      shared_main_thread_contexts_ =
1072          ContextProviderCommandBuffer::Create(CreateOffscreenContext3d(),
1073                                               "Offscreen-MainThread");
1074    } else {
1075      // In single threaded mode, we can use the same context provider.
1076      shared_main_thread_contexts_ =
1077          static_cast<ContextProviderCommandBuffer*>(
1078                OffscreenCompositorContextProvider().get());
1079    }
1080  }
1081  if (shared_main_thread_contexts_ &&
1082      !shared_main_thread_contexts_->BindToCurrentThread())
1083    shared_main_thread_contexts_ = NULL;
1084  return shared_main_thread_contexts_;
1085}
1086
1087AudioRendererMixerManager* RenderThreadImpl::GetAudioRendererMixerManager() {
1088  if (!audio_renderer_mixer_manager_) {
1089    audio_renderer_mixer_manager_.reset(new AudioRendererMixerManager(
1090        GetAudioHardwareConfig()));
1091  }
1092
1093  return audio_renderer_mixer_manager_.get();
1094}
1095
1096media::AudioHardwareConfig* RenderThreadImpl::GetAudioHardwareConfig() {
1097  if (!audio_hardware_config_) {
1098    media::AudioParameters input_params;
1099    media::AudioParameters output_params;
1100    Send(new ViewHostMsg_GetAudioHardwareConfig(
1101        &input_params, &output_params));
1102
1103    audio_hardware_config_.reset(new media::AudioHardwareConfig(
1104        input_params, output_params));
1105    audio_message_filter_->SetAudioHardwareConfig(audio_hardware_config_.get());
1106  }
1107
1108  return audio_hardware_config_.get();
1109}
1110
1111base::WaitableEvent* RenderThreadImpl::GetShutdownEvent() {
1112  return ChildProcess::current()->GetShutDownEvent();
1113}
1114
1115#if defined(OS_WIN)
1116void RenderThreadImpl::PreCacheFontCharacters(const LOGFONT& log_font,
1117                                              const base::string16& str) {
1118  Send(new ViewHostMsg_PreCacheFontCharacters(log_font, str));
1119}
1120
1121void RenderThreadImpl::PreCacheFont(const LOGFONT& log_font) {
1122  Send(new ChildProcessHostMsg_PreCacheFont(log_font));
1123}
1124
1125void RenderThreadImpl::ReleaseCachedFonts() {
1126  Send(new ChildProcessHostMsg_ReleaseCachedFonts());
1127}
1128
1129#endif  // OS_WIN
1130
1131bool RenderThreadImpl::IsMainThread() {
1132  return !!current();
1133}
1134
1135base::MessageLoop* RenderThreadImpl::GetMainLoop() {
1136  return message_loop();
1137}
1138
1139scoped_refptr<base::MessageLoopProxy> RenderThreadImpl::GetIOLoopProxy() {
1140  return io_message_loop_proxy_;
1141}
1142
1143scoped_ptr<base::SharedMemory> RenderThreadImpl::AllocateSharedMemory(
1144    size_t size) {
1145  return scoped_ptr<base::SharedMemory>(
1146      HostAllocateSharedMemoryBuffer(size));
1147}
1148
1149int32 RenderThreadImpl::CreateViewCommandBuffer(
1150      int32 surface_id, const GPUCreateCommandBufferConfig& init_params) {
1151  TRACE_EVENT1("gpu",
1152               "RenderThreadImpl::CreateViewCommandBuffer",
1153               "surface_id",
1154               surface_id);
1155
1156  int32 route_id = MSG_ROUTING_NONE;
1157  IPC::Message* message = new GpuHostMsg_CreateViewCommandBuffer(
1158      surface_id,
1159      init_params,
1160      &route_id);
1161
1162  // Allow calling this from the compositor thread.
1163  thread_safe_sender()->Send(message);
1164
1165  return route_id;
1166}
1167
1168void RenderThreadImpl::CreateImage(
1169    gfx::PluginWindowHandle window,
1170    int32 image_id,
1171    const CreateImageCallback& callback) {
1172  NOTREACHED();
1173}
1174
1175void RenderThreadImpl::DeleteImage(int32 image_id, int32 sync_point) {
1176  NOTREACHED();
1177}
1178
1179scoped_ptr<gfx::GpuMemoryBuffer> RenderThreadImpl::AllocateGpuMemoryBuffer(
1180    size_t width,
1181    size_t height,
1182    unsigned internalformat) {
1183  DCHECK(allocate_gpu_memory_buffer_thread_checker_.CalledOnValidThread());
1184
1185  if (!GpuMemoryBufferImpl::IsFormatValid(internalformat))
1186    return scoped_ptr<gfx::GpuMemoryBuffer>();
1187
1188  gfx::GpuMemoryBufferHandle handle;
1189  bool success;
1190  IPC::Message* message =
1191      new ChildProcessHostMsg_SyncAllocateGpuMemoryBuffer(width,
1192                                                          height,
1193                                                          internalformat,
1194                                                          &handle);
1195
1196  // Allow calling this from the compositor thread.
1197  if (base::MessageLoop::current() == message_loop())
1198    success = ChildThread::Send(message);
1199  else
1200    success = sync_message_filter()->Send(message);
1201
1202  if (!success)
1203    return scoped_ptr<gfx::GpuMemoryBuffer>();
1204
1205  return GpuMemoryBufferImpl::Create(
1206      handle,
1207      gfx::Size(width, height),
1208      internalformat).PassAs<gfx::GpuMemoryBuffer>();
1209}
1210
1211void RenderThreadImpl::DoNotSuspendWebKitSharedTimer() {
1212  suspend_webkit_shared_timer_ = false;
1213}
1214
1215void RenderThreadImpl::DoNotNotifyWebKitOfModalLoop() {
1216  notify_webkit_of_modal_loop_ = false;
1217}
1218
1219void RenderThreadImpl::OnSetZoomLevelForCurrentURL(const std::string& scheme,
1220                                                   const std::string& host,
1221                                                   double zoom_level) {
1222  RenderViewZoomer zoomer(scheme, host, zoom_level);
1223  RenderView::ForEach(&zoomer);
1224}
1225
1226bool RenderThreadImpl::OnControlMessageReceived(const IPC::Message& msg) {
1227  ObserverListBase<RenderProcessObserver>::Iterator it(observers_);
1228  RenderProcessObserver* observer;
1229  while ((observer = it.GetNext()) != NULL) {
1230    if (observer->OnControlMessageReceived(msg))
1231      return true;
1232  }
1233
1234  // Some messages are handled by delegates.
1235  if (appcache_dispatcher_->OnMessageReceived(msg) ||
1236      dom_storage_dispatcher_->OnMessageReceived(msg) ||
1237      embedded_worker_dispatcher_->OnMessageReceived(msg)) {
1238    return true;
1239  }
1240
1241  bool handled = true;
1242  IPC_BEGIN_MESSAGE_MAP(RenderThreadImpl, msg)
1243    IPC_MESSAGE_HANDLER(ViewMsg_SetZoomLevelForCurrentURL,
1244                        OnSetZoomLevelForCurrentURL)
1245    // TODO(port): removed from render_messages_internal.h;
1246    // is there a new non-windows message I should add here?
1247    IPC_MESSAGE_HANDLER(ViewMsg_New, OnCreateNewView)
1248    IPC_MESSAGE_HANDLER(ViewMsg_PurgePluginListCache, OnPurgePluginListCache)
1249    IPC_MESSAGE_HANDLER(ViewMsg_NetworkStateChanged, OnNetworkStateChanged)
1250    IPC_MESSAGE_HANDLER(ViewMsg_TempCrashWithData, OnTempCrashWithData)
1251    IPC_MESSAGE_HANDLER(WorkerProcessMsg_CreateWorker, OnCreateNewSharedWorker)
1252    IPC_MESSAGE_HANDLER(ViewMsg_TimezoneChange, OnUpdateTimezone)
1253#if defined(OS_ANDROID)
1254    IPC_MESSAGE_HANDLER(ViewMsg_SetWebKitSharedTimersSuspended,
1255                        OnSetWebKitSharedTimersSuspended)
1256#endif
1257#if defined(OS_MACOSX)
1258    IPC_MESSAGE_HANDLER(ViewMsg_UpdateScrollbarTheme, OnUpdateScrollbarTheme)
1259#endif
1260    IPC_MESSAGE_UNHANDLED(handled = false)
1261  IPC_END_MESSAGE_MAP()
1262  return handled;
1263}
1264
1265void RenderThreadImpl::OnCreateNewView(const ViewMsg_New_Params& params) {
1266  EnsureWebKitInitialized();
1267  // When bringing in render_view, also bring in webkit's glue and jsbindings.
1268  RenderViewImpl::Create(params.opener_route_id,
1269                         params.renderer_preferences,
1270                         params.web_preferences,
1271                         params.view_id,
1272                         params.main_frame_routing_id,
1273                         params.surface_id,
1274                         params.session_storage_namespace_id,
1275                         params.frame_name,
1276                         false,
1277                         params.swapped_out,
1278                         params.hidden,
1279                         params.next_page_id,
1280                         params.screen_info,
1281                         params.accessibility_mode);
1282}
1283
1284GpuChannelHost* RenderThreadImpl::EstablishGpuChannelSync(
1285    CauseForGpuLaunch cause_for_gpu_launch) {
1286  TRACE_EVENT0("gpu", "RenderThreadImpl::EstablishGpuChannelSync");
1287
1288  if (gpu_channel_.get()) {
1289    // Do nothing if we already have a GPU channel or are already
1290    // establishing one.
1291    if (!gpu_channel_->IsLost())
1292      return gpu_channel_.get();
1293
1294    // Recreate the channel if it has been lost.
1295    gpu_channel_ = NULL;
1296  }
1297
1298  // Ask the browser for the channel name.
1299  int client_id = 0;
1300  IPC::ChannelHandle channel_handle;
1301  gpu::GPUInfo gpu_info;
1302  if (!Send(new GpuHostMsg_EstablishGpuChannel(cause_for_gpu_launch,
1303                                               &client_id,
1304                                               &channel_handle,
1305                                               &gpu_info)) ||
1306#if defined(OS_POSIX)
1307      channel_handle.socket.fd == -1 ||
1308#endif
1309      channel_handle.name.empty()) {
1310    // Otherwise cancel the connection.
1311    return NULL;
1312  }
1313
1314  GetContentClient()->SetGpuInfo(gpu_info);
1315
1316  // Cache some variables that are needed on the compositor thread for our
1317  // implementation of GpuChannelHostFactory.
1318  io_message_loop_proxy_ = ChildProcess::current()->io_message_loop_proxy();
1319
1320  gpu_channel_ = GpuChannelHost::Create(
1321      this, gpu_info, channel_handle,
1322      ChildProcess::current()->GetShutDownEvent());
1323  return gpu_channel_.get();
1324}
1325
1326blink::WebMediaStreamCenter* RenderThreadImpl::CreateMediaStreamCenter(
1327    blink::WebMediaStreamCenterClient* client) {
1328#if defined(OS_ANDROID)
1329  if (CommandLine::ForCurrentProcess()->HasSwitch(
1330      switches::kDisableWebRTC))
1331    return NULL;
1332#endif
1333
1334#if defined(ENABLE_WEBRTC)
1335  if (!media_stream_center_) {
1336    media_stream_center_ = GetContentClient()->renderer()
1337        ->OverrideCreateWebMediaStreamCenter(client);
1338    if (!media_stream_center_) {
1339      scoped_ptr<MediaStreamCenter> media_stream_center(
1340          new MediaStreamCenter(client, GetMediaStreamDependencyFactory()));
1341      AddObserver(media_stream_center.get());
1342      media_stream_center_ = media_stream_center.release();
1343    }
1344  }
1345#endif
1346  return media_stream_center_;
1347}
1348
1349MediaStreamDependencyFactory*
1350RenderThreadImpl::GetMediaStreamDependencyFactory() {
1351  return media_stream_factory_.get();
1352}
1353
1354GpuChannelHost* RenderThreadImpl::GetGpuChannel() {
1355  if (!gpu_channel_.get())
1356    return NULL;
1357
1358  if (gpu_channel_->IsLost())
1359    return NULL;
1360
1361  return gpu_channel_.get();
1362}
1363
1364void RenderThreadImpl::OnPurgePluginListCache(bool reload_pages) {
1365  EnsureWebKitInitialized();
1366  // The call below will cause a GetPlugins call with refresh=true, but at this
1367  // point we already know that the browser has refreshed its list, so disable
1368  // refresh temporarily to prevent each renderer process causing the list to be
1369  // regenerated.
1370  webkit_platform_support_->set_plugin_refresh_allowed(false);
1371  blink::resetPluginCache(reload_pages);
1372  webkit_platform_support_->set_plugin_refresh_allowed(true);
1373
1374  FOR_EACH_OBSERVER(RenderProcessObserver, observers_, PluginListChanged());
1375}
1376
1377void RenderThreadImpl::OnNetworkStateChanged(bool online) {
1378  EnsureWebKitInitialized();
1379  WebNetworkStateNotifier::setOnLine(online);
1380  FOR_EACH_OBSERVER(RenderProcessObserver, observers_,
1381      NetworkStateChanged(online));
1382}
1383
1384void RenderThreadImpl::OnTempCrashWithData(const GURL& data) {
1385  GetContentClient()->SetActiveURL(data);
1386  CHECK(false);
1387}
1388
1389void RenderThreadImpl::OnUpdateTimezone() {
1390  NotifyTimezoneChange();
1391}
1392
1393
1394#if defined(OS_ANDROID)
1395void RenderThreadImpl::OnSetWebKitSharedTimersSuspended(bool suspend) {
1396  if (suspend_webkit_shared_timer_) {
1397    EnsureWebKitInitialized();
1398    if (suspend) {
1399      webkit_platform_support_->SuspendSharedTimer();
1400    } else {
1401      webkit_platform_support_->ResumeSharedTimer();
1402    }
1403    webkit_shared_timer_suspended_ = suspend;
1404  }
1405}
1406#endif
1407
1408#if defined(OS_MACOSX)
1409void RenderThreadImpl::OnUpdateScrollbarTheme(
1410    float initial_button_delay,
1411    float autoscroll_button_delay,
1412    bool jump_on_track_click,
1413    blink::ScrollerStyle preferred_scroller_style,
1414    bool redraw) {
1415  EnsureWebKitInitialized();
1416  static_cast<WebScrollbarBehaviorImpl*>(
1417      webkit_platform_support_->scrollbarBehavior())->set_jump_on_track_click(
1418          jump_on_track_click);
1419  blink::WebScrollbarTheme::updateScrollbars(initial_button_delay,
1420                                             autoscroll_button_delay,
1421                                             preferred_scroller_style,
1422                                             redraw);
1423}
1424#endif
1425
1426void RenderThreadImpl::OnCreateNewSharedWorker(
1427    const WorkerProcessMsg_CreateWorker_Params& params) {
1428  // EmbeddedSharedWorkerStub will self-destruct.
1429  new EmbeddedSharedWorkerStub(params.url,
1430                               params.name,
1431                               params.content_security_policy,
1432                               params.security_policy_type,
1433                               params.route_id);
1434}
1435
1436void RenderThreadImpl::OnMemoryPressure(
1437    base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level) {
1438  base::allocator::ReleaseFreeMemory();
1439
1440  if (memory_pressure_level ==
1441      base::MemoryPressureListener::MEMORY_PRESSURE_CRITICAL) {
1442    // Trigger full v8 garbage collection on critical memory notification.
1443    v8::V8::LowMemoryNotification();
1444    // Clear the image cache.
1445    blink::WebImageCache::clear();
1446    // Purge Skia font cache, by setting it to 0 and then again to the previous
1447    // limit.
1448    size_t font_cache_limit = SkGraphics::SetFontCacheLimit(0);
1449    SkGraphics::SetFontCacheLimit(font_cache_limit);
1450  } else {
1451    // Otherwise trigger a couple of v8 GCs using IdleNotification.
1452    if (!v8::V8::IdleNotification())
1453      v8::V8::IdleNotification();
1454  }
1455}
1456
1457scoped_refptr<base::MessageLoopProxy>
1458RenderThreadImpl::GetFileThreadMessageLoopProxy() {
1459  DCHECK(message_loop() == base::MessageLoop::current());
1460  if (!file_thread_) {
1461    file_thread_.reset(new base::Thread("Renderer::FILE"));
1462    file_thread_->Start();
1463  }
1464  return file_thread_->message_loop_proxy();
1465}
1466
1467scoped_refptr<base::MessageLoopProxy>
1468RenderThreadImpl::GetMediaThreadMessageLoopProxy() {
1469  DCHECK(message_loop() == base::MessageLoop::current());
1470  if (!media_thread_) {
1471    media_thread_.reset(new base::Thread("Media"));
1472    media_thread_->Start();
1473
1474#if defined(OS_ANDROID)
1475    renderer_demuxer_ = new RendererDemuxerAndroid();
1476    AddFilter(renderer_demuxer_.get());
1477#endif
1478  }
1479  return media_thread_->message_loop_proxy();
1480}
1481
1482void RenderThreadImpl::SetFlingCurveParameters(
1483    const std::vector<float>& new_touchpad,
1484    const std::vector<float>& new_touchscreen) {
1485  webkit_platform_support_->SetFlingCurveParameters(new_touchpad,
1486                                                    new_touchscreen);
1487
1488}
1489
1490void RenderThreadImpl::SampleGamepads(blink::WebGamepads* data) {
1491  if (!gamepad_shared_memory_reader_)
1492    gamepad_shared_memory_reader_.reset(new GamepadSharedMemoryReader);
1493  gamepad_shared_memory_reader_->SampleGamepads(*data);
1494}
1495
1496void RenderThreadImpl::WidgetCreated() {
1497  widget_count_++;
1498}
1499
1500void RenderThreadImpl::WidgetDestroyed() {
1501  widget_count_--;
1502}
1503
1504void RenderThreadImpl::WidgetHidden() {
1505  DCHECK_LT(hidden_widget_count_, widget_count_);
1506  hidden_widget_count_++;
1507
1508  if (widget_count_ && hidden_widget_count_ == widget_count_) {
1509#if !defined(SYSTEM_NATIVELY_SIGNALS_MEMORY_PRESSURE)
1510    // TODO(vollick): Remove this this heavy-handed approach once we're polling
1511    // the real system memory pressure.
1512    base::MemoryPressureListener::NotifyMemoryPressure(
1513        base::MemoryPressureListener::MEMORY_PRESSURE_MODERATE);
1514#endif
1515    if (GetContentClient()->renderer()->RunIdleHandlerWhenWidgetsHidden())
1516      ScheduleIdleHandler(kInitialIdleHandlerDelayMs);
1517  }
1518}
1519
1520void RenderThreadImpl::WidgetRestored() {
1521  DCHECK_GT(hidden_widget_count_, 0);
1522  hidden_widget_count_--;
1523
1524  if (!GetContentClient()->renderer()->RunIdleHandlerWhenWidgetsHidden()) {
1525    return;
1526  }
1527
1528  ScheduleIdleHandler(kLongIdleHandlerDelayMs);
1529}
1530
1531}  // namespace content
1532