[Sync] Split DirectoryChangeListener for thread-safety

chrome/browser/sync/syncable/syncable_mock.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_BROWSER_SYNC_SYNCABLE_SYNCABLE_MOCK_H_
 #define CHROME_BROWSER_SYNC_SYNCABLE_SYNCABLE_MOCK_H_
 #pragma once
 
 #include <string>
 
 #include "chrome/browser/sync/syncable/syncable.h"
+#include "chrome/test/sync/null_directory_change_delegate.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using syncable::Directory;
 using syncable::EntryKernel;
 
 class MockDirectory : public Directory {
  public:
   MockDirectory();
   virtual ~MockDirectory();
 
   MOCK_METHOD1(GetEntryByHandle, syncable::EntryKernel*(int64));
 
   MOCK_METHOD2(set_last_downloadstamp, void(syncable::ModelType, int64));
 
   MOCK_METHOD1(GetEntryByClientTag,
                syncable::EntryKernel*(const std::string&));
+
+ private:
+  syncable::NullDirectoryChangeDelegate delegate_;
 };
 
 class MockSyncableWriteTransaction : public syncable::WriteTransaction {
  public:
   explicit MockSyncableWriteTransaction(Directory *directory);
 };
 
 
 #endif  // CHROME_BROWSER_SYNC_SYNCABLE_SYNCABLE_MOCK_H_