Add sync manager classes for backup/rollback:

sync/internal_api/public/test/test_internal_components_factory.h

 // Copyright (c) 2012 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 SYNC_INTERNAL_API_PUBLIC_TEST_TEST_INTERNAL_COMPONENTS_FACTORY_H_
 #define SYNC_INTERNAL_API_PUBLIC_TEST_TEST_INTERNAL_COMPONENTS_FACTORY_H_
 
 #include "sync/internal_api/public/internal_components_factory.h"
 
 namespace syncer {
 
 enum StorageOption {
   // BuildDirectoryBackingStore should not use persistent on-disk storage.
   STORAGE_IN_MEMORY,
   // Use this if you want BuildDirectoryBackingStore to create a real
   // on disk store.
   STORAGE_ON_DISK,
   // Use this to test the case where a directory fails to load.
   STORAGE_INVALID
 };
 
 class TestInternalComponentsFactory : public InternalComponentsFactory {
  public:
+  // Create SyncSessionContext and DirectoryBackingStore using specified
+  // settings.
   explicit TestInternalComponentsFactory(const Switches& switches,
                                          StorageOption option);
+  // Create SyncSessionContext using default settings. Return injected |store|
+  // when BuildDirectoryBackingStore() is called so that injector can check
+  // store data.
+  explicit TestInternalComponentsFactory(
+      scoped_ptr<syncable::DirectoryBackingStore> store);
   virtual ~TestInternalComponentsFactory();
 
   virtual scoped_ptr<SyncScheduler> BuildScheduler(
       const std::string& name,
       sessions::SyncSessionContext* context,
       syncer::CancelationSignal* cancelation_signal) OVERRIDE;
 
   virtual scoped_ptr<sessions::SyncSessionContext> BuildContext(
       ServerConnectionManager* connection_manager,
       syncable::Directory* directory,
       ExtensionsActivity* monitor,
       const std::vector<SyncEngineEventListener*>& listeners,
       sessions::DebugInfoGetter* debug_info_getter,
       ModelTypeRegistry* model_type_registry,
       const std::string& invalidator_client_id) OVERRIDE;
 
   virtual scoped_ptr<syncable::DirectoryBackingStore>
   BuildDirectoryBackingStore(
       const std::string& dir_name,
       const base::FilePath& backing_filepath) OVERRIDE;
 
   virtual Switches GetSwitches() const OVERRIDE;
 
  private:
   const Switches switches_;
   const StorageOption storage_option_;
 
+  scoped_ptr<syncable::DirectoryBackingStore> store_;
+
   DISALLOW_COPY_AND_ASSIGN(TestInternalComponentsFactory);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_TEST_TEST_INTERNAL_COMPONENTS_FACTORY_H_