Add return values to SyncerCommand

chrome/browser/sync/engine/store_timestamps_command.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_SYNC_ENGINE_STORE_TIMESTAMPS_COMMAND_H_
 #define CHROME_BROWSER_SYNC_ENGINE_STORE_TIMESTAMPS_COMMAND_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "chrome/browser/sync/engine/syncer_command.h"
@@ skipping 12 matching lines @@
 //
 // Postconditions - The next_timestamp returned by the server will be
 //                  saved into the directory (where it will be used
 //                  the next time that DownloadUpdatesCommand runs).
 class StoreTimestampsCommand : public SyncerCommand {
  public:
   StoreTimestampsCommand();
   virtual ~StoreTimestampsCommand();
 
   // SyncerCommand implementation.
-  virtual void ExecuteImpl(sessions::SyncSession* session) OVERRIDE;
+  virtual SyncerError ExecuteImpl(sessions::SyncSession* session) OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(StoreTimestampsCommand);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_ENGINE_STORE_TIMESTAMPS_COMMAND_H_