[Sync] Plumb initial type set from engine to DTM.

components/sync/driver/glue/sync_backend_host_impl.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_SYNC_DRIVER_GLUE_SYNC_BACKEND_HOST_IMPL_H_
 #define COMPONENTS_SYNC_DRIVER_GLUE_SYNC_BACKEND_HOST_IMPL_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 142 matching lines @@
       const ModelTypeSet succeeded_configuration_types,
       const ModelTypeSet failed_configuration_types,
       const base::Callback<void(ModelTypeSet, ModelTypeSet)>& ready_task);
 
   // Reports backend initialization success.  Includes some objects from sync
   // manager initialization to be passed back to the UI thread.
   //
   // |model_type_connector| is our ModelTypeConnector, which is owned because in
   // production it is a proxy object to the real ModelTypeConnector.
   virtual void HandleInitializationSuccessOnFrontendLoop(
+      ModelTypeSet initial_types,
       const WeakHandle<JsBackend> js_backend,
       const WeakHandle<DataTypeDebugInfoListener> debug_info_listener,
       std::unique_ptr<ModelTypeConnector> model_type_connector,
       const std::string& cache_guid);
 
   // Forwards a ProtocolEvent to the host. Will not be called unless a call to
   // SetForwardProtocolEvents() explicitly requested that we start forwarding
   // these events.
   void HandleProtocolEventOnFrontendLoop(std::unique_ptr<ProtocolEvent> event);
 
@@ skipping 166 matching lines @@
   base::ThreadChecker thread_checker_;
 
   base::WeakPtrFactory<SyncBackendHostImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncBackendHostImpl);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_DRIVER_GLUE_SYNC_BACKEND_HOST_IMPL_H_