Add sync manager classes for backup/rollback:

sync/internal_api/test/test_internal_components_factory.cc

Index: sync/internal_api/test/test_internal_components_factory.cc
diff --git a/sync/internal_api/test/test_internal_components_factory.cc b/sync/internal_api/test/test_internal_components_factory.cc
index c7d94e9b513d34a27786dd5c67ea7481bf087f9a..44e9f68fd54c76203a0cd08ffad6c876c16b0aba 100644
--- a/sync/internal_api/test/test_internal_components_factory.cc
+++ b/sync/internal_api/test/test_internal_components_factory.cc
@@ -19,6 +19,13 @@ TestInternalComponentsFactory::TestInternalComponentsFactory(
       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(
@@ -55,6 +62,9 @@ TestInternalComponentsFactory::BuildContext(
 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>(