[sync] skeleton implementation of TypedURLSyncBridge

components/browser_sync/profile_sync_components_factory_impl.cc

Index: components/browser_sync/profile_sync_components_factory_impl.cc
diff --git a/components/browser_sync/profile_sync_components_factory_impl.cc b/components/browser_sync/profile_sync_components_factory_impl.cc
index c5f9a8ddbeb740cb86edf62c20b02932424e4c2c..91d8e754e738a7279f93737f510019f824ce5592 100644
--- a/components/browser_sync/profile_sync_components_factory_impl.cc
+++ b/components/browser_sync/profile_sync_components_factory_impl.cc
@@ -209,9 +209,15 @@ void ProfileSyncComponentsFactoryImpl::RegisterCommonDataTypes(
   // TypedUrl sync is enabled by default.  Register unless explicitly disabled,
   // or if saving history is disabled.
   if (!disabled_types.Has(syncer::TYPED_URLS) && !history_disabled) {
-    sync_service->RegisterDataTypeController(
-        base::MakeUnique<TypedUrlDataTypeController>(
-            error_callback, sync_client_, history_disabled_pref_));
+    if (base::FeatureList::IsEnabled(switches::kSyncUSSTypedURL)) {
+      sync_service->RegisterDataTypeController(
+          base::MakeUnique<ModelTypeController>(syncer::TYPED_URLS,
+                                                sync_client_, db_thread_));

[skym, 2017/03/03 17:41:09]

db_thread_ ? Are you sure that's right? I don't see any direct references to the
db thread in the existing typed urls code.

[Gang Wu, 2017/03/06 08:21:24]

will add real implementation later, so add TODO here.

+    } else {
+      sync_service->RegisterDataTypeController(
+          base::MakeUnique<TypedUrlDataTypeController>(
+              error_callback, sync_client_, history_disabled_pref_));
+    }
   }
 
   // Delete directive sync is enabled by default.  Register unless full history