Commit History transaction when app is backgrounded on iOS

components/history/core/browser/history_backend.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/history/core/browser/history_backend.h"
 
 #include <algorithm>
 #include <functional>
 #include <list>
 #include <map>
@@ skipping 26 matching lines @@
 #include "components/history/core/browser/page_usage_data.h"
 #include "components/history/core/browser/typed_url_syncable_service.h"
 #include "components/history/core/browser/visit_filter.h"
 #include "net/base/registry_controlled_domains/registry_controlled_domain.h"
 #include "sql/error_delegate_util.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/codec/png_codec.h"
 #include "url/gurl.h"
 #include "url/url_constants.h"
 
+#if defined(OS_IOS)
+#include "base/ios/scoped_critical_action.h"
+#endif
+
 using base::Time;
 using base::TimeDelta;
 using base::TimeTicks;
 
 /* The HistoryBackend consists of two components:
 
     HistoryDatabase (stores past 3 months of history)
       URLDatabase (stores a list of URLs)
       DownloadDatabase (stores a list of downloads)
       VisitDatabase (stores a list of visits for the URLs)
@@ skipping 196 matching lines @@
 void HistoryBackend::Closing() {
   // Any scheduled commit will have a reference to us, we must make it
   // release that reference before we can be destroyed.
   CancelScheduledCommit();
 
   // Release our reference to the delegate, this reference will be keeping the
   // history service alive.
   delegate_.reset();
 }
 
+#if defined(OS_IOS)
+void HistoryBackend::PersistState() {
+  Commit();
+}
+#endif
+
 void HistoryBackend::ClearCachedDataForContextID(ContextID context_id) {
   tracker_.ClearCachedDataForContextID(context_id);
 }
 
 base::FilePath HistoryBackend::GetThumbnailFileName() const {
   return history_dir_.Append(kThumbnailsFilename);
 }
 
 base::FilePath HistoryBackend::GetFaviconsFileName() const {
   return history_dir_.Append(kFaviconsFilename);
@@ skipping 1888 matching lines @@
   if (!redirect_list.empty()) {
     std::set<GURL> favicons_changed(redirect_list.begin(), redirect_list.end());
     NotifyFaviconChanged(favicons_changed);
   }
 }
 
 void HistoryBackend::Commit() {
   if (!db_)
     return;
 
+#if defined(OS_IOS)
+  // Attempts to get the application running long enough to commit the database
+  // transaction if it is currently being backgrounded.
+  base::ios::ScopedCriticalAction scoped_critical_action;
+#endif
+
   // Note that a commit may not actually have been scheduled if a caller
   // explicitly calls this instead of using ScheduleCommit. Likewise, we
   // may reset the flag written by a pending commit. But this is OK! It
   // will merely cause extra commits (which is kind of the idea). We
   // could optimize more for this case (we may get two extra commits in
   // some cases) but it hasn't been important yet.
   CancelScheduledCommit();
 
   db_->CommitTransaction();
   DCHECK(db_->transaction_nesting() == 0) << "Somebody left a transaction open";
@@ skipping 464 matching lines @@
   info.url_id = visit.url_id;
   info.time = visit.visit_time;
   info.transition = visit.transition;
   // If we don't have a delegate yet during setup or shutdown, we will drop
   // these notifications.
   if (delegate_)
     delegate_->NotifyAddVisit(info);
 }
 
 }  // namespace history