Sync: Refactoring DataTypeController to make the design shareable with USS datatypes.

components/sync_driver/fake_sync_client.h

 // Copyright 2015 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 COMPONENTS_SYNC_DRIVER_FAKE_SYNC_CLIENT_H_
 #define COMPONENTS_SYNC_DRIVER_FAKE_SYNC_CLIENT_H_
 
 #include "components/sync_driver/sync_client.h"
 
 namespace sync_driver {
+class FakeSyncService;
 
 // Fake implementation of SyncClient interface for tests.
 class FakeSyncClient : public SyncClient {
  public:
   FakeSyncClient();
   explicit FakeSyncClient(SyncApiComponentFactory* factory);
   ~FakeSyncClient() override;
 
   SyncService* GetSyncService() override;
   PrefService* GetPrefService() override;
   bookmarks::BookmarkModel* GetBookmarkModel() override;
   history::HistoryService* GetHistoryService() override;
   scoped_refptr<password_manager::PasswordStore> GetPasswordStore() override;
   autofill::PersonalDataManager* GetPersonalDataManager() override;
   scoped_refptr<autofill::AutofillWebDataService> GetWebDataService() override;
   base::WeakPtr<syncer::SyncableService> GetSyncableServiceForType(
       syncer::ModelType type) override;
   SyncApiComponentFactory* GetSyncApiComponentFactory() override;
 
  private:
   SyncApiComponentFactory* factory_;
+  scoped_ptr<FakeSyncService> sync_service_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeSyncClient);
 };
 
 }  // namespace sync_driver
 
 #endif  // COMPONENTS_SYNC_DRIVER_FAKE_SYNC_CLIENT_H_