history_service.cc revision c2e0dbddbe15c98d52c4786dac06cb8952a8ae6d 
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// The history system runs on a background thread so that potentially slow
6// database operations don't delay the browser. This backend processing is
7// represented by HistoryBackend. The HistoryService's job is to dispatch to
8// that thread.
9//
10// Main thread                       History thread
11// -----------                       --------------
12// HistoryService <----------------> HistoryBackend
13//                                   -> HistoryDatabase
14//                                      -> SQLite connection to History
15//                                   -> ArchivedDatabase
16//                                      -> SQLite connection to Archived History
17//                                   -> TextDatabaseManager
18//                                      -> SQLite connection to one month's data
19//                                      -> SQLite connection to one month's data
20//                                      ...
21//                                   -> ThumbnailDatabase
22//                                      -> SQLite connection to Thumbnails
23//                                         (and favicons)
24
25#include "chrome/browser/history/history_service.h"
26
27#include "base/bind_helpers.h"
28#include "base/callback.h"
29#include "base/command_line.h"
30#include "base/compiler_specific.h"
31#include "base/location.h"
32#include "base/memory/ref_counted.h"
33#include "base/message_loop.h"
34#include "base/path_service.h"
35#include "base/prefs/pref_service.h"
36#include "base/thread_task_runner_handle.h"
37#include "base/threading/thread.h"
38#include "base/time.h"
39#include "chrome/browser/autocomplete/history_url_provider.h"
40#include "chrome/browser/bookmarks/bookmark_model.h"
41#include "chrome/browser/bookmarks/bookmark_model_factory.h"
42#include "chrome/browser/browser_process.h"
43#include "chrome/browser/history/download_row.h"
44#include "chrome/browser/history/history_backend.h"
45#include "chrome/browser/history/history_notifications.h"
46#include "chrome/browser/history/history_types.h"
47#include "chrome/browser/history/in_memory_database.h"
48#include "chrome/browser/history/in_memory_history_backend.h"
49#include "chrome/browser/history/in_memory_url_index.h"
50#include "chrome/browser/history/top_sites.h"
51#include "chrome/browser/history/visit_database.h"
52#include "chrome/browser/history/visit_filter.h"
53#include "chrome/browser/history/web_history_service.h"
54#include "chrome/browser/history/web_history_service_factory.h"
55#include "chrome/browser/profiles/profile.h"
56#include "chrome/browser/ui/profile_error_dialog.h"
57#include "chrome/common/chrome_constants.h"
58#include "chrome/common/chrome_notification_types.h"
59#include "chrome/common/chrome_switches.h"
60#include "chrome/common/pref_names.h"
61#include "chrome/common/thumbnail_score.h"
62#include "chrome/common/url_constants.h"
63#include "components/visitedlink/browser/visitedlink_master.h"
64#include "content/public/browser/browser_thread.h"
65#include "content/public/browser/notification_service.h"
66#include "grit/chromium_strings.h"
67#include "grit/generated_resources.h"
68#include "sync/api/sync_error_factory.h"
69#include "third_party/skia/include/core/SkBitmap.h"
70
71using base::Time;
72using history::HistoryBackend;
73
74namespace {
75
76static const char* kHistoryThreadName = "Chrome_HistoryThread";
77
78void DerefDownloadDbHandle(
79    const HistoryService::DownloadCreateCallback& callback,
80    int64* db_handle) {
81  callback.Run(*db_handle);
82}
83
84void DerefDownloadId(
85    const HistoryService::DownloadNextIdCallback& callback,
86    int* id) {
87  callback.Run(*id);
88}
89
90void RunWithFaviconResults(
91    const FaviconService::FaviconResultsCallback& callback,
92    std::vector<history::FaviconBitmapResult>* bitmap_results) {
93  callback.Run(*bitmap_results);
94}
95
96// Extract history::URLRows into GURLs for VisitedLinkMaster.
97class URLIteratorFromURLRows
98    : public components::VisitedLinkMaster::URLIterator {
99 public:
100  explicit URLIteratorFromURLRows(const history::URLRows& url_rows)
101      : itr_(url_rows.begin()),
102        end_(url_rows.end()) {
103  }
104
105  virtual const GURL& NextURL() OVERRIDE {
106    return (itr_++)->url();
107  }
108
109  virtual bool HasNextURL() const OVERRIDE {
110    return itr_ != end_;
111  }
112
113 private:
114  history::URLRows::const_iterator itr_;
115  history::URLRows::const_iterator end_;
116
117  DISALLOW_COPY_AND_ASSIGN(URLIteratorFromURLRows);
118};
119
120// Callback from WebHistoryService::ExpireWebHistory().
121void ExpireWebHistoryComplete(
122    history::WebHistoryService::Request* request,
123    bool success) {
124  // Ignore the result and delete the request.
125  delete request;
126}
127
128}  // namespace
129
130// Sends messages from the backend to us on the main thread. This must be a
131// separate class from the history service so that it can hold a reference to
132// the history service (otherwise we would have to manually AddRef and
133// Release when the Backend has a reference to us).
134class HistoryService::BackendDelegate : public HistoryBackend::Delegate {
135 public:
136  BackendDelegate(
137      const base::WeakPtr<HistoryService>& history_service,
138      const scoped_refptr<base::SequencedTaskRunner>& service_task_runner,
139      Profile* profile)
140      : history_service_(history_service),
141        service_task_runner_(service_task_runner),
142        profile_(profile) {
143  }
144
145  virtual void NotifyProfileError(int backend_id,
146                                  sql::InitStatus init_status) OVERRIDE {
147    // Send to the history service on the main thread.
148    service_task_runner_->PostTask(
149        FROM_HERE,
150        base::Bind(&HistoryService::NotifyProfileError, history_service_,
151                   backend_id, init_status));
152  }
153
154  virtual void SetInMemoryBackend(int backend_id,
155      history::InMemoryHistoryBackend* backend) OVERRIDE {
156    // Send the backend to the history service on the main thread.
157    service_task_runner_->PostTask(
158        FROM_HERE,
159        base::Bind(&HistoryService::SetInMemoryBackend, history_service_,
160                   backend_id, backend));
161  }
162
163  virtual void BroadcastNotifications(
164      int type,
165      history::HistoryDetails* details) OVERRIDE {
166    // Send the notification on the history thread.
167    if (content::NotificationService::current()) {
168      content::Details<history::HistoryDetails> det(details);
169      content::NotificationService::current()->Notify(
170          type, content::Source<Profile>(profile_), det);
171    }
172    // Send the notification to the history service on the main thread.
173    service_task_runner_->PostTask(
174        FROM_HERE,
175        base::Bind(&HistoryService::BroadcastNotificationsHelper,
176                   history_service_, type, base::Owned(details)));
177  }
178
179  virtual void DBLoaded(int backend_id) OVERRIDE {
180    service_task_runner_->PostTask(
181        FROM_HERE,
182        base::Bind(&HistoryService::OnDBLoaded, history_service_,
183                   backend_id));
184  }
185
186  virtual void StartTopSitesMigration(int backend_id) OVERRIDE {
187    service_task_runner_->PostTask(
188        FROM_HERE,
189        base::Bind(&HistoryService::StartTopSitesMigration,
190                   history_service_, backend_id));
191  }
192
193  virtual void NotifyVisitDBObserversOnAddVisit(
194      const history::BriefVisitInfo& info) OVERRIDE {
195    service_task_runner_->PostTask(
196        FROM_HERE,
197        base::Bind(&HistoryService::NotifyVisitDBObserversOnAddVisit,
198                   history_service_, info));
199  }
200
201 private:
202  const base::WeakPtr<HistoryService> history_service_;
203  const scoped_refptr<base::SequencedTaskRunner> service_task_runner_;
204  Profile* const profile_;
205};
206
207// The history thread is intentionally not a BrowserThread because the
208// sync integration unit tests depend on being able to create more than one
209// history thread.
210HistoryService::HistoryService()
211    : weak_ptr_factory_(this),
212      thread_(new base::Thread(kHistoryThreadName)),
213      profile_(NULL),
214      backend_loaded_(false),
215      current_backend_id_(-1),
216      bookmark_service_(NULL),
217      no_db_(false),
218      needs_top_sites_migration_(false) {
219}
220
221HistoryService::HistoryService(Profile* profile)
222    : weak_ptr_factory_(this),
223      thread_(new base::Thread(kHistoryThreadName)),
224      profile_(profile),
225      visitedlink_master_(new components::VisitedLinkMaster(
226          profile, this, true)),
227      backend_loaded_(false),
228      current_backend_id_(-1),
229      bookmark_service_(NULL),
230      no_db_(false),
231      needs_top_sites_migration_(false) {
232  DCHECK(profile_);
233  registrar_.Add(this, chrome::NOTIFICATION_HISTORY_URLS_DELETED,
234                 content::Source<Profile>(profile_));
235  registrar_.Add(this, chrome::NOTIFICATION_TEMPLATE_URL_REMOVED,
236                 content::Source<Profile>(profile_));
237}
238
239HistoryService::~HistoryService() {
240  DCHECK(thread_checker_.CalledOnValidThread());
241  // Shutdown the backend. This does nothing if Cleanup was already invoked.
242  Cleanup();
243}
244
245bool HistoryService::BackendLoaded() {
246  DCHECK(thread_checker_.CalledOnValidThread());
247  // NOTE: We start the backend loading even though it completes asynchronously
248  // and thus won't affect the return value of this function.  This is because
249  // callers of this assume that if the backend isn't yet loaded it will be
250  // soon, so they will either listen for notifications or just retry this call
251  // later.  If we've purged the backend, we haven't necessarily restarted it
252  // loading by now, so we need to trigger the load in order to maintain that
253  // expectation.
254  LoadBackendIfNecessary();
255  return backend_loaded_;
256}
257
258void HistoryService::UnloadBackend() {
259  DCHECK(thread_checker_.CalledOnValidThread());
260  if (!history_backend_)
261    return;  // Already unloaded.
262
263  // Get rid of the in-memory backend.
264  in_memory_backend_.reset();
265
266  // Give the InMemoryURLIndex a chance to shutdown.
267  if (in_memory_url_index_.get())
268    in_memory_url_index_->ShutDown();
269
270  // The backend's destructor must run on the history thread since it is not
271  // threadsafe. So this thread must not be the last thread holding a reference
272  // to the backend, or a crash could happen.
273  //
274  // We have a reference to the history backend. There is also an extra
275  // reference held by our delegate installed in the backend, which
276  // HistoryBackend::Closing will release. This means if we scheduled a call
277  // to HistoryBackend::Closing and *then* released our backend reference, there
278  // will be a race between us and the backend's Closing function to see who is
279  // the last holder of a reference. If the backend thread's Closing manages to
280  // run before we release our backend refptr, the last reference will be held
281  // by this thread and the destructor will be called from here.
282  //
283  // Therefore, we create a closure to run the Closing operation first. This
284  // holds a reference to the backend. Then we release our reference, then we
285  // schedule the task to run. After the task runs, it will delete its reference
286  // from the history thread, ensuring everything works properly.
287  //
288  // TODO(ajwong): Cleanup HistoryBackend lifetime issues.
289  //     See http://crbug.com/99767.
290  history_backend_->AddRef();
291  base::Closure closing_task =
292      base::Bind(&HistoryBackend::Closing, history_backend_.get());
293  ScheduleTask(PRIORITY_NORMAL, closing_task);
294  closing_task.Reset();
295  HistoryBackend* raw_ptr = history_backend_.get();
296  history_backend_ = NULL;
297  thread_->message_loop()->ReleaseSoon(FROM_HERE, raw_ptr);
298}
299
300void HistoryService::Cleanup() {
301  DCHECK(thread_checker_.CalledOnValidThread());
302  if (!thread_) {
303    // We've already cleaned up.
304    return;
305  }
306
307  weak_ptr_factory_.InvalidateWeakPtrs();
308
309  // Unload the backend.
310  UnloadBackend();
311
312  // Delete the thread, which joins with the background thread. We defensively
313  // NULL the pointer before deleting it in case somebody tries to use it
314  // during shutdown, but this shouldn't happen.
315  base::Thread* thread = thread_;
316  thread_ = NULL;
317  delete thread;
318}
319
320void HistoryService::NotifyRenderProcessHostDestruction(const void* host) {
321  DCHECK(thread_checker_.CalledOnValidThread());
322  ScheduleAndForget(PRIORITY_NORMAL,
323                    &HistoryBackend::NotifyRenderProcessHostDestruction, host);
324}
325
326history::URLDatabase* HistoryService::InMemoryDatabase() {
327  DCHECK(thread_checker_.CalledOnValidThread());
328  // NOTE: See comments in BackendLoaded() as to why we call
329  // LoadBackendIfNecessary() here even though it won't affect the return value
330  // for this call.
331  LoadBackendIfNecessary();
332  if (in_memory_backend_.get())
333    return in_memory_backend_->db();
334  return NULL;
335}
336
337bool HistoryService::GetTypedCountForURL(const GURL& url, int* typed_count) {
338  DCHECK(thread_checker_.CalledOnValidThread());
339  history::URLRow url_row;
340  if (!GetRowForURL(url, &url_row))
341    return false;
342  *typed_count = url_row.typed_count();
343  return true;
344}
345
346bool HistoryService::GetLastVisitTimeForURL(const GURL& url,
347                                            base::Time* last_visit) {
348  DCHECK(thread_checker_.CalledOnValidThread());
349  history::URLRow url_row;
350  if (!GetRowForURL(url, &url_row))
351    return false;
352  *last_visit = url_row.last_visit();
353  return true;
354}
355
356bool HistoryService::GetVisitCountForURL(const GURL& url, int* visit_count) {
357  DCHECK(thread_checker_.CalledOnValidThread());
358  history::URLRow url_row;
359  if (!GetRowForURL(url, &url_row))
360    return false;
361  *visit_count = url_row.visit_count();
362  return true;
363}
364
365void HistoryService::Shutdown() {
366  DCHECK(thread_checker_.CalledOnValidThread());
367  // It's possible that bookmarks haven't loaded and history is waiting for
368  // bookmarks to complete loading. In such a situation history can't shutdown
369  // (meaning if we invoked history_service_->Cleanup now, we would
370  // deadlock). To break the deadlock we tell BookmarkModel it's about to be
371  // deleted so that it can release the signal history is waiting on, allowing
372  // history to shutdown (history_service_->Cleanup to complete). In such a
373  // scenario history sees an incorrect view of bookmarks, but it's better
374  // than a deadlock.
375  BookmarkModel* bookmark_model = static_cast<BookmarkModel*>(
376      BookmarkModelFactory::GetForProfileIfExists(profile_));
377  if (bookmark_model)
378    bookmark_model->Shutdown();
379
380  Cleanup();
381}
382
383void HistoryService::SetKeywordSearchTermsForURL(const GURL& url,
384                                                 TemplateURLID keyword_id,
385                                                 const string16& term) {
386  DCHECK(thread_checker_.CalledOnValidThread());
387  ScheduleAndForget(PRIORITY_UI,
388                    &HistoryBackend::SetKeywordSearchTermsForURL,
389                    url, keyword_id, term);
390}
391
392void HistoryService::DeleteAllSearchTermsForKeyword(
393    TemplateURLID keyword_id) {
394  DCHECK(thread_checker_.CalledOnValidThread());
395  ScheduleAndForget(PRIORITY_UI,
396                    &HistoryBackend::DeleteAllSearchTermsForKeyword,
397                    keyword_id);
398}
399
400HistoryService::Handle HistoryService::GetMostRecentKeywordSearchTerms(
401    TemplateURLID keyword_id,
402    const string16& prefix,
403    int max_count,
404    CancelableRequestConsumerBase* consumer,
405    const GetMostRecentKeywordSearchTermsCallback& callback) {
406  DCHECK(thread_checker_.CalledOnValidThread());
407  return Schedule(PRIORITY_UI, &HistoryBackend::GetMostRecentKeywordSearchTerms,
408                  consumer,
409                  new history::GetMostRecentKeywordSearchTermsRequest(callback),
410                  keyword_id, prefix, max_count);
411}
412
413void HistoryService::URLsNoLongerBookmarked(const std::set<GURL>& urls) {
414  DCHECK(thread_checker_.CalledOnValidThread());
415  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::URLsNoLongerBookmarked,
416                    urls);
417}
418
419void HistoryService::ScheduleDBTask(history::HistoryDBTask* task,
420                                    CancelableRequestConsumerBase* consumer) {
421  DCHECK(thread_checker_.CalledOnValidThread());
422  history::HistoryDBTaskRequest* request = new history::HistoryDBTaskRequest(
423      base::Bind(&history::HistoryDBTask::DoneRunOnMainThread, task));
424  request->value = task;  // The value is the task to execute.
425  Schedule(PRIORITY_UI, &HistoryBackend::ProcessDBTask, consumer, request);
426}
427
428HistoryService::Handle HistoryService::QuerySegmentUsageSince(
429    CancelableRequestConsumerBase* consumer,
430    const Time from_time,
431    int max_result_count,
432    const SegmentQueryCallback& callback) {
433  DCHECK(thread_checker_.CalledOnValidThread());
434  return Schedule(PRIORITY_UI, &HistoryBackend::QuerySegmentUsage,
435                  consumer, new history::QuerySegmentUsageRequest(callback),
436                  from_time, max_result_count);
437}
438
439void HistoryService::IncreaseSegmentDuration(const GURL& url,
440                                             Time time,
441                                             base::TimeDelta delta) {
442  DCHECK(thread_checker_.CalledOnValidThread());
443  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::IncreaseSegmentDuration,
444                    url, time, delta);
445}
446
447HistoryService::Handle HistoryService::QuerySegmentDurationSince(
448    CancelableRequestConsumerBase* consumer,
449    base::Time from_time,
450    int max_result_count,
451    const SegmentQueryCallback& callback) {
452  DCHECK(thread_checker_.CalledOnValidThread());
453  return Schedule(PRIORITY_UI, &HistoryBackend::QuerySegmentDuration,
454                  consumer, new history::QuerySegmentUsageRequest(callback),
455                  from_time, max_result_count);
456}
457
458void HistoryService::SetOnBackendDestroyTask(const base::Closure& task) {
459  DCHECK(thread_checker_.CalledOnValidThread());
460  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::SetOnBackendDestroyTask,
461                    MessageLoop::current(), task);
462}
463
464void HistoryService::AddPage(const GURL& url,
465                             Time time,
466                             const void* id_scope,
467                             int32 page_id,
468                             const GURL& referrer,
469                             const history::RedirectList& redirects,
470                             content::PageTransition transition,
471                             history::VisitSource visit_source,
472                             bool did_replace_entry) {
473  DCHECK(thread_checker_.CalledOnValidThread());
474  AddPage(
475      history::HistoryAddPageArgs(url, time, id_scope, page_id, referrer,
476                                  redirects, transition, visit_source,
477                                  did_replace_entry));
478}
479
480void HistoryService::AddPage(const GURL& url,
481                             base::Time time,
482                             history::VisitSource visit_source) {
483  DCHECK(thread_checker_.CalledOnValidThread());
484  AddPage(
485      history::HistoryAddPageArgs(url, time, NULL, 0, GURL(),
486                                  history::RedirectList(),
487                                  content::PAGE_TRANSITION_LINK,
488                                  visit_source, false));
489}
490
491void HistoryService::AddPage(const history::HistoryAddPageArgs& add_page_args) {
492  DCHECK(thread_checker_.CalledOnValidThread());
493  DCHECK(thread_) << "History service being called after cleanup";
494
495  // Filter out unwanted URLs. We don't add auto-subframe URLs. They are a
496  // large part of history (think iframes for ads) and we never display them in
497  // history UI. We will still add manual subframes, which are ones the user
498  // has clicked on to get.
499  if (!CanAddURL(add_page_args.url))
500    return;
501
502  // Add link & all redirects to visited link list.
503  if (visitedlink_master_) {
504    visitedlink_master_->AddURL(add_page_args.url);
505
506    if (!add_page_args.redirects.empty()) {
507      // We should not be asked to add a page in the middle of a redirect chain.
508      DCHECK_EQ(add_page_args.url,
509                add_page_args.redirects[add_page_args.redirects.size() - 1]);
510
511      // We need the !redirects.empty() condition above since size_t is unsigned
512      // and will wrap around when we subtract one from a 0 size.
513      for (size_t i = 0; i < add_page_args.redirects.size() - 1; i++)
514        visitedlink_master_->AddURL(add_page_args.redirects[i]);
515    }
516  }
517
518  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::AddPage, add_page_args);
519}
520
521void HistoryService::AddPageNoVisitForBookmark(const GURL& url,
522                                               const string16& title) {
523  DCHECK(thread_checker_.CalledOnValidThread());
524  if (!CanAddURL(url))
525    return;
526
527  ScheduleAndForget(PRIORITY_NORMAL,
528                    &HistoryBackend::AddPageNoVisitForBookmark, url, title);
529}
530
531void HistoryService::SetPageTitle(const GURL& url,
532                                  const string16& title) {
533  DCHECK(thread_checker_.CalledOnValidThread());
534  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::SetPageTitle, url, title);
535}
536
537void HistoryService::UpdateWithPageEndTime(const void* host,
538                                           int32 page_id,
539                                           const GURL& url,
540                                           Time end_ts) {
541  DCHECK(thread_checker_.CalledOnValidThread());
542  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::UpdateWithPageEndTime,
543                    host, page_id, url, end_ts);
544}
545
546void HistoryService::AddPageWithDetails(const GURL& url,
547                                        const string16& title,
548                                        int visit_count,
549                                        int typed_count,
550                                        Time last_visit,
551                                        bool hidden,
552                                        history::VisitSource visit_source) {
553  DCHECK(thread_checker_.CalledOnValidThread());
554  // Filter out unwanted URLs.
555  if (!CanAddURL(url))
556    return;
557
558  // Add to the visited links system.
559  if (visitedlink_master_)
560    visitedlink_master_->AddURL(url);
561
562  history::URLRow row(url);
563  row.set_title(title);
564  row.set_visit_count(visit_count);
565  row.set_typed_count(typed_count);
566  row.set_last_visit(last_visit);
567  row.set_hidden(hidden);
568
569  history::URLRows rows;
570  rows.push_back(row);
571
572  ScheduleAndForget(PRIORITY_NORMAL,
573                    &HistoryBackend::AddPagesWithDetails, rows, visit_source);
574}
575
576void HistoryService::AddPagesWithDetails(const history::URLRows& info,
577                                         history::VisitSource visit_source) {
578  DCHECK(thread_checker_.CalledOnValidThread());
579  // Add to the visited links system.
580  if (visitedlink_master_) {
581    std::vector<GURL> urls;
582    urls.reserve(info.size());
583    for (history::URLRows::const_iterator i = info.begin(); i != info.end();
584         ++i)
585      urls.push_back(i->url());
586
587    visitedlink_master_->AddURLs(urls);
588  }
589
590  ScheduleAndForget(PRIORITY_NORMAL,
591                    &HistoryBackend::AddPagesWithDetails, info, visit_source);
592}
593
594void HistoryService::SetPageContents(const GURL& url,
595                                     const string16& contents) {
596  DCHECK(thread_checker_.CalledOnValidThread());
597  if (!CanAddURL(url))
598    return;
599
600  ScheduleAndForget(PRIORITY_LOW, &HistoryBackend::SetPageContents,
601                    url, contents);
602}
603
604HistoryService::Handle HistoryService::GetPageThumbnail(
605    const GURL& page_url,
606    CancelableRequestConsumerBase* consumer,
607    const ThumbnailDataCallback& callback) {
608  DCHECK(thread_checker_.CalledOnValidThread());
609  return Schedule(PRIORITY_NORMAL, &HistoryBackend::GetPageThumbnail, consumer,
610                  new history::GetPageThumbnailRequest(callback), page_url);
611}
612
613CancelableTaskTracker::TaskId HistoryService::GetFavicons(
614    const std::vector<GURL>& icon_urls,
615    int icon_types,
616    int desired_size_in_dip,
617    const std::vector<ui::ScaleFactor>& desired_scale_factors,
618    const FaviconService::FaviconResultsCallback& callback,
619    CancelableTaskTracker* tracker) {
620  DCHECK(thread_checker_.CalledOnValidThread());
621  LoadBackendIfNecessary();
622
623  std::vector<history::FaviconBitmapResult>* results =
624      new std::vector<history::FaviconBitmapResult>();
625  return tracker->PostTaskAndReply(
626      thread_->message_loop_proxy(),
627      FROM_HERE,
628      base::Bind(&HistoryBackend::GetFavicons,
629                 history_backend_.get(), icon_urls, icon_types,
630                 desired_size_in_dip, desired_scale_factors, results),
631      base::Bind(&RunWithFaviconResults, callback, base::Owned(results)));
632}
633
634CancelableTaskTracker::TaskId HistoryService::GetFaviconsForURL(
635    const GURL& page_url,
636    int icon_types,
637    int desired_size_in_dip,
638    const std::vector<ui::ScaleFactor>& desired_scale_factors,
639    const FaviconService::FaviconResultsCallback& callback,
640    CancelableTaskTracker* tracker) {
641  DCHECK(thread_checker_.CalledOnValidThread());
642  LoadBackendIfNecessary();
643
644  std::vector<history::FaviconBitmapResult>* results =
645      new std::vector<history::FaviconBitmapResult>();
646  return tracker->PostTaskAndReply(
647      thread_->message_loop_proxy(),
648      FROM_HERE,
649      base::Bind(&HistoryBackend::GetFaviconsForURL,
650                 history_backend_.get(), page_url, icon_types,
651                 desired_size_in_dip, desired_scale_factors, results),
652      base::Bind(&RunWithFaviconResults, callback, base::Owned(results)));
653}
654
655CancelableTaskTracker::TaskId HistoryService::GetFaviconForID(
656    history::FaviconID favicon_id,
657    int desired_size_in_dip,
658    ui::ScaleFactor desired_scale_factor,
659    const FaviconService::FaviconResultsCallback& callback,
660    CancelableTaskTracker* tracker) {
661  DCHECK(thread_checker_.CalledOnValidThread());
662  LoadBackendIfNecessary();
663
664  std::vector<history::FaviconBitmapResult>* results =
665      new std::vector<history::FaviconBitmapResult>();
666  return tracker->PostTaskAndReply(
667      thread_->message_loop_proxy(),
668      FROM_HERE,
669      base::Bind(&HistoryBackend::GetFaviconForID,
670                 history_backend_.get(), favicon_id,
671                 desired_size_in_dip, desired_scale_factor, results),
672      base::Bind(&RunWithFaviconResults, callback, base::Owned(results)));
673}
674
675CancelableTaskTracker::TaskId HistoryService::UpdateFaviconMappingsAndFetch(
676    const GURL& page_url,
677    const std::vector<GURL>& icon_urls,
678    int icon_types,
679    int desired_size_in_dip,
680    const std::vector<ui::ScaleFactor>& desired_scale_factors,
681    const FaviconService::FaviconResultsCallback& callback,
682    CancelableTaskTracker* tracker) {
683  DCHECK(thread_checker_.CalledOnValidThread());
684  LoadBackendIfNecessary();
685
686  std::vector<history::FaviconBitmapResult>* results =
687      new std::vector<history::FaviconBitmapResult>();
688  return tracker->PostTaskAndReply(
689      thread_->message_loop_proxy(),
690      FROM_HERE,
691      base::Bind(&HistoryBackend::UpdateFaviconMappingsAndFetch,
692                 history_backend_.get(), page_url, icon_urls, icon_types,
693                 desired_size_in_dip, desired_scale_factors, results),
694      base::Bind(&RunWithFaviconResults, callback, base::Owned(results)));
695}
696
697void HistoryService::MergeFavicon(
698    const GURL& page_url,
699    const GURL& icon_url,
700    history::IconType icon_type,
701    scoped_refptr<base::RefCountedMemory> bitmap_data,
702    const gfx::Size& pixel_size) {
703  DCHECK(thread_checker_.CalledOnValidThread());
704  if (!CanAddURL(page_url))
705    return;
706
707  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::MergeFavicon, page_url,
708                    icon_url, icon_type, bitmap_data, pixel_size);
709}
710
711void HistoryService::SetFavicons(
712    const GURL& page_url,
713    history::IconType icon_type,
714    const std::vector<history::FaviconBitmapData>& favicon_bitmap_data) {
715  DCHECK(thread_checker_.CalledOnValidThread());
716  if (!CanAddURL(page_url))
717    return;
718
719  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::SetFavicons, page_url,
720      icon_type, favicon_bitmap_data);
721}
722
723void HistoryService::SetFaviconsOutOfDateForPage(const GURL& page_url) {
724  DCHECK(thread_checker_.CalledOnValidThread());
725  ScheduleAndForget(PRIORITY_NORMAL,
726                    &HistoryBackend::SetFaviconsOutOfDateForPage, page_url);
727}
728
729void HistoryService::CloneFavicons(const GURL& old_page_url,
730                                   const GURL& new_page_url) {
731  DCHECK(thread_checker_.CalledOnValidThread());
732  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::CloneFavicons,
733                    old_page_url, new_page_url);
734}
735
736void HistoryService::SetImportedFavicons(
737    const std::vector<history::ImportedFaviconUsage>& favicon_usage) {
738  DCHECK(thread_checker_.CalledOnValidThread());
739  ScheduleAndForget(PRIORITY_NORMAL,
740                    &HistoryBackend::SetImportedFavicons, favicon_usage);
741}
742
743HistoryService::Handle HistoryService::QueryURL(
744    const GURL& url,
745    bool want_visits,
746    CancelableRequestConsumerBase* consumer,
747    const QueryURLCallback& callback) {
748  DCHECK(thread_checker_.CalledOnValidThread());
749  return Schedule(PRIORITY_UI, &HistoryBackend::QueryURL, consumer,
750                  new history::QueryURLRequest(callback), url, want_visits);
751}
752
753// Downloads -------------------------------------------------------------------
754
755// Handle creation of a download by creating an entry in the history service's
756// 'downloads' table.
757void HistoryService::CreateDownload(
758    const history::DownloadRow& create_info,
759    const HistoryService::DownloadCreateCallback& callback) {
760  DCHECK(thread_) << "History service being called after cleanup";
761  DCHECK(thread_checker_.CalledOnValidThread());
762  LoadBackendIfNecessary();
763  int64* db_handle = new int64(
764      history::DownloadDatabase::kUninitializedHandle);
765  thread_->message_loop_proxy()->PostTaskAndReply(
766      FROM_HERE,
767      base::Bind(&HistoryBackend::CreateDownload,
768                 history_backend_.get(),
769                 create_info,
770                 db_handle),
771      base::Bind(&DerefDownloadDbHandle, callback, base::Owned(db_handle)));
772}
773
774void HistoryService::GetNextDownloadId(const DownloadNextIdCallback& callback) {
775  DCHECK(thread_) << "History service being called after cleanup";
776  DCHECK(thread_checker_.CalledOnValidThread());
777  LoadBackendIfNecessary();
778  int* id = new int(history::DownloadDatabase::kUninitializedHandle);
779  thread_->message_loop_proxy()->PostTaskAndReply(
780      FROM_HERE,
781      base::Bind(&HistoryBackend::GetNextDownloadId,
782                 history_backend_.get(),
783                 id),
784      base::Bind(&DerefDownloadId, callback, base::Owned(id)));
785}
786
787// Handle queries for a list of all downloads in the history database's
788// 'downloads' table.
789void HistoryService::QueryDownloads(
790    const DownloadQueryCallback& callback) {
791  DCHECK(thread_) << "History service being called after cleanup";
792  DCHECK(thread_checker_.CalledOnValidThread());
793  LoadBackendIfNecessary();
794  std::vector<history::DownloadRow>* rows =
795    new std::vector<history::DownloadRow>();
796  scoped_ptr<std::vector<history::DownloadRow> > scoped_rows(rows);
797  // Beware! The first Bind() does not simply |scoped_rows.get()| because
798  // base::Passed(&scoped_rows) nullifies |scoped_rows|, and compilers do not
799  // guarantee that the first Bind's arguments are evaluated before the second
800  // Bind's arguments.
801  thread_->message_loop_proxy()->PostTaskAndReply(
802      FROM_HERE,
803      base::Bind(&HistoryBackend::QueryDownloads, history_backend_.get(), rows),
804      base::Bind(callback, base::Passed(&scoped_rows)));
805}
806
807// Handle updates for a particular download. This is a 'fire and forget'
808// operation, so we don't need to be called back.
809void HistoryService::UpdateDownload(const history::DownloadRow& data) {
810  DCHECK(thread_checker_.CalledOnValidThread());
811  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::UpdateDownload, data);
812}
813
814void HistoryService::RemoveDownloads(const std::set<int64>& db_handles) {
815  DCHECK(thread_checker_.CalledOnValidThread());
816  ScheduleAndForget(PRIORITY_NORMAL,
817                    &HistoryBackend::RemoveDownloads, db_handles);
818}
819
820HistoryService::Handle HistoryService::QueryHistory(
821    const string16& text_query,
822    const history::QueryOptions& options,
823    CancelableRequestConsumerBase* consumer,
824    const QueryHistoryCallback& callback) {
825  DCHECK(thread_checker_.CalledOnValidThread());
826  return Schedule(PRIORITY_UI, &HistoryBackend::QueryHistory, consumer,
827                  new history::QueryHistoryRequest(callback),
828                  text_query, options);
829}
830
831HistoryService::Handle HistoryService::QueryRedirectsFrom(
832    const GURL& from_url,
833    CancelableRequestConsumerBase* consumer,
834    const QueryRedirectsCallback& callback) {
835  DCHECK(thread_checker_.CalledOnValidThread());
836  return Schedule(PRIORITY_UI, &HistoryBackend::QueryRedirectsFrom, consumer,
837      new history::QueryRedirectsRequest(callback), from_url);
838}
839
840HistoryService::Handle HistoryService::QueryRedirectsTo(
841    const GURL& to_url,
842    CancelableRequestConsumerBase* consumer,
843    const QueryRedirectsCallback& callback) {
844  DCHECK(thread_checker_.CalledOnValidThread());
845  return Schedule(PRIORITY_NORMAL, &HistoryBackend::QueryRedirectsTo, consumer,
846      new history::QueryRedirectsRequest(callback), to_url);
847}
848
849HistoryService::Handle HistoryService::GetVisibleVisitCountToHost(
850    const GURL& url,
851    CancelableRequestConsumerBase* consumer,
852    const GetVisibleVisitCountToHostCallback& callback) {
853  DCHECK(thread_checker_.CalledOnValidThread());
854  return Schedule(PRIORITY_UI, &HistoryBackend::GetVisibleVisitCountToHost,
855      consumer, new history::GetVisibleVisitCountToHostRequest(callback), url);
856}
857
858HistoryService::Handle HistoryService::QueryTopURLsAndRedirects(
859    int result_count,
860    CancelableRequestConsumerBase* consumer,
861    const QueryTopURLsAndRedirectsCallback& callback) {
862  DCHECK(thread_checker_.CalledOnValidThread());
863  return Schedule(PRIORITY_NORMAL, &HistoryBackend::QueryTopURLsAndRedirects,
864      consumer, new history::QueryTopURLsAndRedirectsRequest(callback),
865      result_count);
866}
867
868HistoryService::Handle HistoryService::QueryMostVisitedURLs(
869    int result_count,
870    int days_back,
871    CancelableRequestConsumerBase* consumer,
872    const QueryMostVisitedURLsCallback& callback) {
873  DCHECK(thread_checker_.CalledOnValidThread());
874  return Schedule(PRIORITY_NORMAL, &HistoryBackend::QueryMostVisitedURLs,
875                  consumer,
876                  new history::QueryMostVisitedURLsRequest(callback),
877                  result_count, days_back);
878}
879
880HistoryService::Handle HistoryService::QueryFilteredURLs(
881    int result_count,
882    const history::VisitFilter& filter,
883    bool extended_info,
884    CancelableRequestConsumerBase* consumer,
885    const QueryFilteredURLsCallback& callback) {
886  DCHECK(thread_checker_.CalledOnValidThread());
887  return Schedule(PRIORITY_NORMAL,
888                  &HistoryBackend::QueryFilteredURLs,
889                  consumer,
890                  new history::QueryFilteredURLsRequest(callback),
891                  result_count, filter, extended_info);
892}
893
894void HistoryService::Observe(int type,
895                             const content::NotificationSource& source,
896                             const content::NotificationDetails& details) {
897  DCHECK(thread_checker_.CalledOnValidThread());
898  if (!thread_)
899    return;
900
901  switch (type) {
902    case chrome::NOTIFICATION_HISTORY_URLS_DELETED: {
903      // Update the visited link system for deleted URLs. We will update the
904      // visited link system for added URLs as soon as we get the add
905      // notification (we don't have to wait for the backend, which allows us to
906      // be faster to update the state).
907      //
908      // For deleted URLs, we don't typically know what will be deleted since
909      // delete notifications are by time. We would also like to be more
910      // respectful of privacy and never tell the user something is gone when it
911      // isn't. Therefore, we update the delete URLs after the fact.
912      if (visitedlink_master_) {
913        content::Details<history::URLsDeletedDetails> deleted_details(details);
914
915        if (deleted_details->all_history) {
916          visitedlink_master_->DeleteAllURLs();
917        } else {
918          URLIteratorFromURLRows iterator(deleted_details->rows);
919          visitedlink_master_->DeleteURLs(&iterator);
920        }
921      }
922      break;
923    }
924
925    case chrome::NOTIFICATION_TEMPLATE_URL_REMOVED:
926      DeleteAllSearchTermsForKeyword(
927          *(content::Details<TemplateURLID>(details).ptr()));
928      break;
929
930    default:
931      NOTREACHED();
932  }
933}
934
935void HistoryService::RebuildTable(
936    const scoped_refptr<URLEnumerator>& enumerator) {
937  DCHECK(thread_checker_.CalledOnValidThread());
938  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::IterateURLs, enumerator);
939}
940
941bool HistoryService::Init(const base::FilePath& history_dir,
942                          BookmarkService* bookmark_service,
943                          bool no_db) {
944  DCHECK(thread_checker_.CalledOnValidThread());
945  if (!thread_->Start()) {
946    Cleanup();
947    return false;
948  }
949
950  history_dir_ = history_dir;
951  bookmark_service_ = bookmark_service;
952  no_db_ = no_db;
953
954  if (profile_) {
955    std::string languages =
956        profile_->GetPrefs()->GetString(prefs::kAcceptLanguages);
957    in_memory_url_index_.reset(
958        new history::InMemoryURLIndex(profile_, history_dir_, languages));
959    in_memory_url_index_->Init();
960  }
961
962  // Create the history backend.
963  LoadBackendIfNecessary();
964
965  if (visitedlink_master_) {
966    bool result = visitedlink_master_->Init();
967    DCHECK(result);
968  }
969
970  return true;
971}
972
973void HistoryService::ScheduleAutocomplete(HistoryURLProvider* provider,
974                                          HistoryURLProviderParams* params) {
975  DCHECK(thread_checker_.CalledOnValidThread());
976  ScheduleAndForget(PRIORITY_UI, &HistoryBackend::ScheduleAutocomplete,
977                    scoped_refptr<HistoryURLProvider>(provider), params);
978}
979
980void HistoryService::ScheduleTask(SchedulePriority priority,
981                                  const base::Closure& task) {
982  DCHECK(thread_checker_.CalledOnValidThread());
983  CHECK(thread_);
984  CHECK(thread_->message_loop());
985  // TODO(brettw): Do prioritization.
986  thread_->message_loop()->PostTask(FROM_HERE, task);
987}
988
989// static
990bool HistoryService::CanAddURL(const GURL& url) {
991  if (!url.is_valid())
992    return false;
993
994  // TODO: We should allow kChromeUIScheme URLs if they have been explicitly
995  // typed.  Right now, however, these are marked as typed even when triggered
996  // by a shortcut or menu action.
997  if (url.SchemeIs(chrome::kJavaScriptScheme) ||
998      url.SchemeIs(chrome::kChromeDevToolsScheme) ||
999      url.SchemeIs(chrome::kChromeUIScheme) ||
1000      url.SchemeIs(chrome::kViewSourceScheme) ||
1001      url.SchemeIs(chrome::kChromeInternalScheme))
1002    return false;
1003
1004  // Allow all about: and chrome: URLs except about:blank, since the user may
1005  // like to see "chrome://memory/", etc. in their history and autocomplete.
1006  if (url == GURL(chrome::kAboutBlankURL))
1007    return false;
1008
1009  return true;
1010}
1011
1012base::WeakPtr<HistoryService> HistoryService::AsWeakPtr() {
1013  DCHECK(thread_checker_.CalledOnValidThread());
1014  return weak_ptr_factory_.GetWeakPtr();
1015}
1016
1017syncer::SyncMergeResult HistoryService::MergeDataAndStartSyncing(
1018    syncer::ModelType type,
1019    const syncer::SyncDataList& initial_sync_data,
1020    scoped_ptr<syncer::SyncChangeProcessor> sync_processor,
1021    scoped_ptr<syncer::SyncErrorFactory> error_handler) {
1022  DCHECK(thread_checker_.CalledOnValidThread());
1023  DCHECK_EQ(type, syncer::HISTORY_DELETE_DIRECTIVES);
1024  delete_directive_handler_.Start(this, initial_sync_data,
1025                                  sync_processor.Pass());
1026  return syncer::SyncMergeResult(type);
1027}
1028
1029void HistoryService::StopSyncing(syncer::ModelType type) {
1030  DCHECK(thread_checker_.CalledOnValidThread());
1031  DCHECK_EQ(type, syncer::HISTORY_DELETE_DIRECTIVES);
1032  delete_directive_handler_.Stop();
1033}
1034
1035syncer::SyncDataList HistoryService::GetAllSyncData(
1036    syncer::ModelType type) const {
1037  DCHECK(thread_checker_.CalledOnValidThread());
1038  DCHECK_EQ(type, syncer::HISTORY_DELETE_DIRECTIVES);
1039  // TODO(akalin): Keep track of existing delete directives.
1040  return syncer::SyncDataList();
1041}
1042
1043syncer::SyncError HistoryService::ProcessSyncChanges(
1044    const tracked_objects::Location& from_here,
1045    const syncer::SyncChangeList& change_list) {
1046  delete_directive_handler_.ProcessSyncChanges(this, change_list);
1047  return syncer::SyncError();
1048}
1049
1050syncer::SyncError HistoryService::ProcessLocalDeleteDirective(
1051    const sync_pb::HistoryDeleteDirectiveSpecifics& delete_directive) {
1052  DCHECK(thread_checker_.CalledOnValidThread());
1053  return delete_directive_handler_.ProcessLocalDeleteDirective(
1054      delete_directive);
1055}
1056
1057void HistoryService::SetInMemoryBackend(int backend_id,
1058    history::InMemoryHistoryBackend* mem_backend) {
1059  DCHECK(thread_checker_.CalledOnValidThread());
1060  if (!history_backend_ || current_backend_id_ != backend_id) {
1061    DVLOG(1) << "Message from obsolete backend";
1062    // Cleaning up the memory backend.
1063    delete mem_backend;
1064    return;
1065  }
1066  DCHECK(!in_memory_backend_.get()) << "Setting mem DB twice";
1067  in_memory_backend_.reset(mem_backend);
1068
1069  // The database requires additional initialization once we own it.
1070  in_memory_backend_->AttachToHistoryService(profile_);
1071}
1072
1073void HistoryService::NotifyProfileError(int backend_id,
1074                                        sql::InitStatus init_status) {
1075  DCHECK(thread_checker_.CalledOnValidThread());
1076  if (!history_backend_ || current_backend_id_ != backend_id) {
1077    DVLOG(1) << "Message from obsolete backend";
1078    return;
1079  }
1080  ShowProfileErrorDialog(
1081      (init_status == sql::INIT_FAILURE) ?
1082      IDS_COULDNT_OPEN_PROFILE_ERROR : IDS_PROFILE_TOO_NEW_ERROR);
1083}
1084
1085void HistoryService::DeleteURL(const GURL& url) {
1086  DCHECK(thread_checker_.CalledOnValidThread());
1087  // We will update the visited links when we observe the delete notifications.
1088  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::DeleteURL, url);
1089}
1090
1091void HistoryService::DeleteURLsForTest(const std::vector<GURL>& urls) {
1092  DCHECK(thread_checker_.CalledOnValidThread());
1093  // We will update the visited links when we observe the delete
1094  // notifications.
1095  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::DeleteURLs, urls);
1096}
1097
1098void HistoryService::ExpireHistoryBetween(
1099    const std::set<GURL>& restrict_urls,
1100    Time begin_time,
1101    Time end_time,
1102    const base::Closure& callback,
1103    CancelableTaskTracker* tracker) {
1104  DCHECK(thread_);
1105  DCHECK(thread_checker_.CalledOnValidThread());
1106  DCHECK(history_backend_.get());
1107  tracker->PostTaskAndReply(
1108      thread_->message_loop_proxy(),
1109      FROM_HERE,
1110      base::Bind(&HistoryBackend::ExpireHistoryBetween,
1111                 history_backend_, restrict_urls, begin_time, end_time),
1112      callback);
1113}
1114
1115void HistoryService::ExpireHistory(
1116    const std::vector<history::ExpireHistoryArgs>& expire_list,
1117    const base::Closure& callback,
1118    CancelableTaskTracker* tracker) {
1119  DCHECK(thread_);
1120  DCHECK(thread_checker_.CalledOnValidThread());
1121  DCHECK(history_backend_.get());
1122  tracker->PostTaskAndReply(
1123      thread_->message_loop_proxy(),
1124      FROM_HERE,
1125      base::Bind(&HistoryBackend::ExpireHistory, history_backend_, expire_list),
1126      callback);
1127}
1128
1129void HistoryService::ExpireLocalAndRemoteHistoryBetween(
1130    const std::set<GURL>& restrict_urls,
1131    Time begin_time,
1132    Time end_time,
1133    const base::Closure& callback,
1134    CancelableTaskTracker* tracker) {
1135  // TODO(dubroy): This should be factored out into a separate class that
1136  // dispatches deletions to the proper places.
1137
1138  history::WebHistoryService* web_history =
1139      WebHistoryServiceFactory::GetForProfile(profile_);
1140  if (web_history) {
1141    // TODO(dubroy): This API does not yet support deletion of specific URLs.
1142    DCHECK(restrict_urls.empty());
1143
1144    delete_directive_handler_.CreateDeleteDirectives(
1145        std::set<int64>(), begin_time, end_time);
1146
1147    // Attempt online deletion from the history server, but ignore the result.
1148    // Deletion directives ensure that the results will eventually be deleted.
1149    // Pass ownership of the request to the callback.
1150    scoped_ptr<history::WebHistoryService::Request> request =
1151        web_history->ExpireHistoryBetween(
1152            restrict_urls, begin_time, end_time,
1153            base::Bind(&ExpireWebHistoryComplete));
1154
1155    // The request will be freed when the callback is called.
1156    CHECK(request.release());
1157  }
1158  ExpireHistoryBetween(restrict_urls, begin_time, end_time, callback, tracker);
1159}
1160
1161void HistoryService::BroadcastNotificationsHelper(
1162    int type,
1163    history::HistoryDetails* details) {
1164  DCHECK(thread_checker_.CalledOnValidThread());
1165  // TODO(evanm): this is currently necessitated by generate_profile, which
1166  // runs without a browser process. generate_profile should really create
1167  // a browser process, at which point this check can then be nuked.
1168  if (!g_browser_process)
1169    return;
1170
1171  if (!thread_)
1172    return;
1173
1174  // The source of all of our notifications is the profile. Note that this
1175  // pointer is NULL in unit tests.
1176  content::Source<Profile> source(profile_);
1177
1178  // The details object just contains the pointer to the object that the
1179  // backend has allocated for us. The receiver of the notification will cast
1180  // this to the proper type.
1181  content::Details<history::HistoryDetails> det(details);
1182
1183  content::NotificationService::current()->Notify(type, source, det);
1184}
1185
1186void HistoryService::LoadBackendIfNecessary() {
1187  DCHECK(thread_checker_.CalledOnValidThread());
1188  if (!thread_ || history_backend_)
1189    return;  // Failed to init, or already started loading.
1190
1191  ++current_backend_id_;
1192  scoped_refptr<HistoryBackend> backend(
1193      new HistoryBackend(history_dir_,
1194                         current_backend_id_,
1195                         new BackendDelegate(
1196                             weak_ptr_factory_.GetWeakPtr(),
1197                             base::ThreadTaskRunnerHandle::Get(),
1198                             profile_),
1199                         bookmark_service_));
1200  history_backend_.swap(backend);
1201
1202  // There may not be a profile when unit testing.
1203  std::string languages;
1204  if (profile_) {
1205    PrefService* prefs = profile_->GetPrefs();
1206    languages = prefs->GetString(prefs::kAcceptLanguages);
1207  }
1208  ScheduleAndForget(PRIORITY_UI, &HistoryBackend::Init, languages, no_db_);
1209}
1210
1211void HistoryService::OnDBLoaded(int backend_id) {
1212  DCHECK(thread_checker_.CalledOnValidThread());
1213  if (!history_backend_ || current_backend_id_ != backend_id) {
1214    DVLOG(1) << "Message from obsolete backend";
1215    return;
1216  }
1217  backend_loaded_ = true;
1218  content::NotificationService::current()->Notify(
1219      chrome::NOTIFICATION_HISTORY_LOADED,
1220      content::Source<Profile>(profile_),
1221      content::Details<HistoryService>(this));
1222  if (thread_ && profile_) {
1223    // We don't want to force creation of TopSites.
1224    history::TopSites* ts = profile_->GetTopSitesWithoutCreating();
1225    if (ts)
1226      ts->HistoryLoaded();
1227  }
1228}
1229
1230bool HistoryService::GetRowForURL(const GURL& url, history::URLRow* url_row) {
1231  DCHECK(thread_checker_.CalledOnValidThread());
1232  history::URLDatabase* db = InMemoryDatabase();
1233  return db && (db->GetRowForURL(url, url_row) != 0);
1234}
1235
1236void HistoryService::StartTopSitesMigration(int backend_id) {
1237  DCHECK(thread_checker_.CalledOnValidThread());
1238  if (!history_backend_ || current_backend_id_ != backend_id) {
1239    DVLOG(1) << "Message from obsolete backend";
1240    return;
1241  }
1242  needs_top_sites_migration_ = true;
1243  if (thread_ && profile_) {
1244    // We don't want to force creation of TopSites.
1245    history::TopSites* ts = profile_->GetTopSitesWithoutCreating();
1246    if (ts)
1247      ts->MigrateFromHistory();
1248  }
1249}
1250
1251void HistoryService::OnTopSitesReady() {
1252  DCHECK(thread_checker_.CalledOnValidThread());
1253  ScheduleAndForget(PRIORITY_NORMAL,
1254                    &HistoryBackend::MigrateThumbnailsDatabase);
1255}
1256
1257void HistoryService::AddVisitDatabaseObserver(
1258    history::VisitDatabaseObserver* observer) {
1259  DCHECK(thread_checker_.CalledOnValidThread());
1260  visit_database_observers_.AddObserver(observer);
1261}
1262
1263void HistoryService::RemoveVisitDatabaseObserver(
1264    history::VisitDatabaseObserver* observer) {
1265  DCHECK(thread_checker_.CalledOnValidThread());
1266  visit_database_observers_.RemoveObserver(observer);
1267}
1268
1269void HistoryService::NotifyVisitDBObserversOnAddVisit(
1270    const history::BriefVisitInfo& info) {
1271  DCHECK(thread_checker_.CalledOnValidThread());
1272  FOR_EACH_OBSERVER(history::VisitDatabaseObserver, visit_database_observers_,
1273                    OnAddVisit(info));
1274}
1275