Not for review: Support sync init with missing or corrupt store

sync/internal_api/js_sync_manager_observer.cc

Index: sync/internal_api/js_sync_manager_observer.cc
diff --git a/sync/internal_api/js_sync_manager_observer.cc b/sync/internal_api/js_sync_manager_observer.cc
index 5aa9dc34ca9632563c6070d89ad68eb49e302cbe..bdf2b7efc2a46b454bd6456266daddb6bd7509b7 100644
--- a/sync/internal_api/js_sync_manager_observer.cc
+++ b/sync/internal_api/js_sync_manager_observer.cc
@@ -125,13 +125,17 @@ void JsSyncManagerObserver::OnActionableError(
 
 void JsSyncManagerObserver::OnInitializationComplete(
     const WeakHandle<JsBackend>& js_backend,
-    bool success) {
+    bool success, syncable::ModelTypeSet restored_types) {
   if (!event_handler_.IsInitialized()) {
     return;
   }
   // Ignore the |js_backend| argument; it's not really convertible to
   // JSON anyway.
-  HandleJsEvent(FROM_HERE, "onInitializationComplete", JsEventDetails());
+
+  DictionaryValue *details = new DictionaryValue();
+  details->Set("restoredTypes", ModelTypeSetToValue(restored_types));
+
+  HandleJsEvent(FROM_HERE, "onInitializationComplete", JsEventDetails(details));
 }
 
 void JsSyncManagerObserver::OnStopSyncingPermanently() {