Provide lazy CommitPendingWrites in addition to eager SavePersistentPrefs.

chrome/browser/prefs/testing_pref_store.h

 // Copyright (c) 2011 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 CHROME_BROWSER_PREFS_TESTING_PREF_STORE_H_
 #define CHROME_BROWSER_PREFS_TESTING_PREF_STORE_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/observer_list.h"
@@ skipping 18 matching lines @@
   virtual bool IsInitializationComplete() const;
 
   // PersistentPrefStore overrides:
   virtual void SetValue(const std::string& key, Value* value);
   virtual void SetValueSilently(const std::string& key, Value* value);
   virtual void RemoveValue(const std::string& key);
   virtual bool ReadOnly() const;
   virtual PersistentPrefStore::PrefReadError ReadPrefs();
   virtual bool WritePrefs();
   virtual void ScheduleWritePrefs() {}
+  virtual void CommitPendingWrite() {}
   // TODO(battre) remove this function
   virtual void ReportValueChanged(const std::string& key);
 
   // Marks the store as having completed initialization.
   void SetInitializationCompleted();
 
   // Used for tests to trigger notifications explicitly.
   void NotifyPrefValueChanged(const std::string& key);
   void NotifyInitializationCompleted();
 
@@ skipping 24 matching lines @@
 
   // Whether initialization has been completed.
   bool init_complete_;
 
   ObserverList<PrefStore::Observer, true> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(TestingPrefStore);
 };
 
 #endif  // CHROME_BROWSER_PREFS_TESTING_PREF_STORE_H_