Make SyncBackendRegistrar aware of loaded data

sync/internal_api/js_sync_manager_observer_unittest.cc

Index: sync/internal_api/js_sync_manager_observer_unittest.cc
diff --git a/sync/internal_api/js_sync_manager_observer_unittest.cc b/sync/internal_api/js_sync_manager_observer_unittest.cc
index 72ea4f3b23018fcf07c7ad0d7444e188563c838e..5e51bf4ad5ee06fbedd05be2f6f4b7f618738903 100644
--- a/sync/internal_api/js_sync_manager_observer_unittest.cc
+++ b/sync/internal_api/js_sync_manager_observer_unittest.cc
@@ -48,22 +48,33 @@ TEST_F(JsSyncManagerObserverTest, NoArgNotifiations) {
   InSequence dummy;
 
   EXPECT_CALL(mock_js_event_handler_,
-              HandleJsEvent("onInitializationComplete",
-                            HasDetails(JsEventDetails())));
-  EXPECT_CALL(mock_js_event_handler_,
               HandleJsEvent("onStopSyncingPermanently",
                             HasDetails(JsEventDetails())));
   EXPECT_CALL(mock_js_event_handler_,
               HandleJsEvent("onEncryptionComplete",
                             HasDetails(JsEventDetails())));
 
-  js_sync_manager_observer_.OnInitializationComplete(WeakHandle<JsBackend>(),
-      true);
   js_sync_manager_observer_.OnStopSyncingPermanently();
   js_sync_manager_observer_.OnEncryptionComplete();
   PumpLoop();
 }
 
+TEST_F(JsSyncManagerObserverTest, OnInitializationComplete) {
+  DictionaryValue expected_details;
+  syncer::ModelTypeSet restored_types;
+  restored_types.Put(BOOKMARKS);
+  restored_types.Put(NIGORI);
+  expected_details.Set("restoredTypes", ModelTypeSetToValue(restored_types));
+
+  EXPECT_CALL(mock_js_event_handler_,
+              HandleJsEvent("onInitializationComplete",
+                            HasDetailsAsDictionary(expected_details)));
+
+  js_sync_manager_observer_.OnInitializationComplete(
+      WeakHandle<JsBackend>(), true, restored_types);
+  PumpLoop();
+}
+
 TEST_F(JsSyncManagerObserverTest, OnSyncCycleCompleted) {
   ModelTypePayloadMap download_progress_markers;
   sessions::SyncSessionSnapshot snapshot(sessions::ModelNeutralState(),