Commit History transaction when app is backgrounded on iOS

components/history/core/browser/history_service.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.
 
 // The history system runs on a background thread so that potentially slow
 // database operations don't delay the browser. This backend processing is
 // represented by HistoryBackend. The HistoryService's job is to dispatch to
 // that thread.
 //
 // Main thread                       History thread
@@ skipping 28 matching lines @@
 #include "components/history/core/browser/in_memory_history_backend.h"
 #include "components/history/core/browser/keyword_search_term.h"
 #include "components/history/core/browser/visit_database.h"
 #include "components/history/core/browser/visit_delegate.h"
 #include "components/history/core/browser/visit_filter.h"
 #include "components/history/core/browser/web_history_service.h"
 #include "components/history/core/common/thumbnail_score.h"
 #include "sync/api/sync_error_factory.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
+#if defined(OS_IOS)
+#include "base/critical_closure.h"
+#endif
+
 using base::Time;
 
 namespace history {
 namespace {
 
 static const char* kHistoryThreadName = "Chrome_HistoryThread";
 
 void RunWithFaviconResults(
     const favicon_base::FaviconResultsCallback& callback,
     std::vector<favicon_base::FaviconRawBitmapResult>* bitmap_results) {
@@ skipping 139 matching lines @@
   DCHECK(thread_checker_.CalledOnValidThread());
   // Shutdown the backend. This does nothing if Cleanup was already invoked.
   Cleanup();
 }
 
 bool HistoryService::BackendLoaded() {
   DCHECK(thread_checker_.CalledOnValidThread());
   return backend_loaded_;
 }
 
+#if defined(OS_IOS)
+void HistoryService::HandleBackgrounding() {
+  if (!thread_ || !history_backend_.get())
+    return;
+
+  ScheduleTask(PRIORITY_NORMAL,
+               base::MakeCriticalClosure(base::Bind(
+                   &HistoryBackend::PersistState, history_backend_.get())));
+}
+#endif
+
 void HistoryService::ClearCachedDataForContextID(ContextID context_id) {
   DCHECK(thread_) << "History service being called after cleanup";
   DCHECK(thread_checker_.CalledOnValidThread());
   ScheduleTask(PRIORITY_NORMAL,
                base::Bind(&HistoryBackend::ClearCachedDataForContextID,
                           history_backend_.get(), context_id));
 }
 
 URLDatabase* HistoryService::InMemoryDatabase() {
   DCHECK(thread_checker_.CalledOnValidThread());
@@ skipping 900 matching lines @@
   return favicon_changed_callback_list_.Add(callback);
 }
 
 void HistoryService::NotifyFaviconChanged(
     const std::set<GURL>& changed_favicons) {
   DCHECK(thread_checker_.CalledOnValidThread());
   favicon_changed_callback_list_.Notify(changed_favicons);
 }
 
 }  // namespace history