Provide lazy CommitPendingWrites in addition to eager SavePersistentPrefs.

chrome/common/json_pref_store.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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_COMMON_JSON_PREF_STORE_H_
 #define CHROME_COMMON_JSON_PREF_STORE_H_
 #pragma once
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 27 matching lines @@
   virtual void RemoveObserver(PrefStore::Observer* observer);
 
   // 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 PrefReadError ReadPrefs();
   virtual bool WritePrefs();
   virtual void ScheduleWritePrefs();
+  virtual void CommitPendingWrite();
   // TODO(battre) remove this function
   virtual void ReportValueChanged(const std::string& key);
 
  private:
   // ImportantFileWriter::DataSerializer overrides:
   virtual bool SerializeData(std::string* output);
 
   FilePath path_;
 
   scoped_ptr<DictionaryValue> prefs_;
 
   bool read_only_;
 
   // Helper for safely writing pref data.
   ImportantFileWriter writer_;
 
   ObserverList<PrefStore::Observer, true> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(JsonPrefStore);
 };
 
 #endif  // CHROME_COMMON_JSON_PREF_STORE_H_