Add sync manager classes for backup/rollback:

sync/internal_api/public/test/test_internal_components_factory.h

Index: sync/internal_api/public/test/test_internal_components_factory.h
diff --git a/sync/internal_api/public/test/test_internal_components_factory.h b/sync/internal_api/public/test/test_internal_components_factory.h
index 3b7d3c5a87741c140bca9121fce6d32cd231bf90..a97172007aca13bb232dd4f830b7b9dbc32ae1fe 100644
--- a/sync/internal_api/public/test/test_internal_components_factory.h
+++ b/sync/internal_api/public/test/test_internal_components_factory.h
@@ -21,8 +21,15 @@ enum StorageOption {
 
 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(
@@ -50,6 +57,8 @@ class TestInternalComponentsFactory : public InternalComponentsFactory {
   const Switches switches_;
   const StorageOption storage_option_;
 
+  scoped_ptr<syncable::DirectoryBackingStore> store_;
+
   DISALLOW_COPY_AND_ASSIGN(TestInternalComponentsFactory);
 };