Provide lazy CommitPendingWrites in addition to eager SavePersistentPrefs.

chrome/common/important_file_writer.h

-// Copyright (c) 2009 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_IMPORTANT_FILE_WRITER_H_
 #define CHROME_COMMON_IMPORTANT_FILE_WRITER_H_
 #pragma once
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
 #include "base/ref_counted.h"
 #include "base/threading/non_thread_safe.h"
 #include "base/time.h"
 #include "base/timer.h"
+#include "content/common/notification_source.h"
 
 namespace base {
 class MessageLoopProxy;
 class Thread;
 }
 
 // Helper to ensure that a file won't be corrupted by the write (for example on
 // application crash). Consider a naive way to save an important file F:
 //
 // 1. Open F for writing, truncating it.
@@ skipping 57 matching lines @@
   void DoScheduledWrite();
 
   base::TimeDelta commit_interval() const {
     return commit_interval_;
   }
 
   void set_commit_interval(const base::TimeDelta& interval) {
     commit_interval_ = interval;
   }
 
+  void set_notification_source(NotificationSource source) { source_ = source; }
+
  private:
   // Path being written to.
   const FilePath path_;
 
   // MessageLoopProxy for the thread on which file I/O can be done.
   scoped_refptr<base::MessageLoopProxy> file_message_loop_proxy_;
 
   // Timer used to schedule commit after ScheduleWrite.
   base::OneShotTimer<ImportantFileWriter> timer_;
 
   // Serializer which will provide the data to be saved.
   DataSerializer* serializer_;
 
   // Time delta after which scheduled data will be written to disk.
   base::TimeDelta commit_interval_;
 
+  // Used as source for PREF_COMMITTED notification.
+  NotificationSource source_;
+
   DISALLOW_COPY_AND_ASSIGN(ImportantFileWriter);
 };
 
 #endif  // CHROME_COMMON_IMPORTANT_FILE_WRITER_H_