Commit History transaction when app is backgrounded on iOS

components/history/core/browser/history_service.h

 // 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.
 
 #ifndef COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_SERVICE_H_
 #define COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_SERVICE_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 87 matching lines @@
   }
 
   // Triggers the backend to load if it hasn't already, and then returns whether
   // it's finished loading.
   // Note: Virtual needed for mocking.
   virtual bool BackendLoaded();
 
   // Returns true if the backend has finished loading.
   bool backend_loaded() const { return backend_loaded_; }
 
+#if defined(OS_IOS)
+  // Causes the history backend to commit any in-progress transactions. Called
+  // when the application is being backgrounded.
+  void HandleBackgrounding();
+#endif
+
   // Context ids are used to scope page IDs (see AddPage). These contexts
   // must tell us when they are being invalidated so that we can clear
   // out any cached data associated with that context.
   void ClearCachedDataForContextID(ContextID context_id);
 
   // Triggers the backend to load if it hasn't already, and then returns the
   // in-memory URL database. The returned pointer may be null if the in-memory
   // database has not been loaded yet. This pointer is owned by the history
   // system. Callers should not store or cache this value.
   //
@@ skipping 685 matching lines @@
 
   // All vended weak pointers are invalidated in Cleanup().
   base::WeakPtrFactory<HistoryService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryService);
 };
 
 }  // namespace history
 
 #endif  // COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_SERVICE_H_