Add sync manager classes for backup/rollback:

sync/internal_api/test/test_internal_components_factory.cc

 // 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.
 
 #include "sync/internal_api/public/test/test_internal_components_factory.h"
 
 #include "sync/sessions/sync_session_context.h"
 #include "sync/syncable/in_memory_directory_backing_store.h"
 #include "sync/syncable/on_disk_directory_backing_store.h"
 #include "sync/syncable/invalid_directory_backing_store.h"
 #include "sync/test/engine/fake_sync_scheduler.h"
 
 namespace syncer {
 
 TestInternalComponentsFactory::TestInternalComponentsFactory(
     const Switches& switches,
     StorageOption option)
     : switches_(switches),
       storage_option_(option) {
 }
 
+TestInternalComponentsFactory::TestInternalComponentsFactory(
+    scoped_ptr<syncable::DirectoryBackingStore> store)
+    : switches_(Switches()),
+      storage_option_(STORAGE_IN_MEMORY) {
+  store_ = store.Pass();
+}
+
 TestInternalComponentsFactory::~TestInternalComponentsFactory() { }
 
 scoped_ptr<SyncScheduler> TestInternalComponentsFactory::BuildScheduler(
     const std::string& name,
     sessions::SyncSessionContext* context,
     syncer::CancelationSignal* cancelation_signal) {
   return scoped_ptr<SyncScheduler>(new FakeSyncScheduler());
 }
 
 scoped_ptr<sessions::SyncSessionContext>
@@ skipping 16 matching lines @@
           switches_.encryption_method == ENCRYPTION_KEYSTORE,
           switches_.pre_commit_updates_policy ==
               FORCE_ENABLE_PRE_COMMIT_UPDATE_AVOIDANCE,
           invalidator_client_id));
 
 }
 
 scoped_ptr<syncable::DirectoryBackingStore>
 TestInternalComponentsFactory::BuildDirectoryBackingStore(
       const std::string& dir_name, const base::FilePath& backing_filepath) {
+  if (store_.get())
+    return store_.Pass();
+
   switch (storage_option_) {
     case STORAGE_IN_MEMORY:
       return scoped_ptr<syncable::DirectoryBackingStore>(
           new syncable::InMemoryDirectoryBackingStore(dir_name));
     case STORAGE_ON_DISK:
       return scoped_ptr<syncable::DirectoryBackingStore>(
           new syncable::OnDiskDirectoryBackingStore(dir_name,
                                                     backing_filepath));
     case STORAGE_INVALID:
       return scoped_ptr<syncable::DirectoryBackingStore>(
           new syncable::InvalidDirectoryBackingStore());
   }
   NOTREACHED();
   return scoped_ptr<syncable::DirectoryBackingStore>();
 }
 
 InternalComponentsFactory::Switches
 TestInternalComponentsFactory::GetSwitches() const {
   return switches_;
 }
 
 }  // namespace syncer