[sync] Set up notification-free infra for triggering local sync refresh

components/sync_driver/fake_sync_service.cc

 // Copyright 2015 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.
 
 #include "components/sync_driver/fake_sync_service.h"
 
 #include "base/values.h"
 #include "sync/internal_api/public/base_transaction.h"
 #include "sync/internal_api/public/sessions/sync_session_snapshot.h"
 #include "sync/internal_api/public/user_share.h"
@@ skipping 12 matching lines @@
 }
 
 bool FakeSyncService::IsSyncAllowed() const {
   return false;
 }
 
 bool FakeSyncService::IsSyncActive() const {
   return false;
 }
 
+void FakeSyncService::TriggerRefresh(const syncer::ModelTypeSet& types) {}
+
 syncer::ModelTypeSet FakeSyncService::GetActiveDataTypes() const {
   return syncer::ModelTypeSet();
 }
 
 SyncClient* FakeSyncService::GetSyncClient() const {
   return nullptr;
 }
 
 void FakeSyncService::AddObserver(SyncServiceObserver* observer) {
 }
@@ skipping 170 matching lines @@
     syncer::TypeDebugInfoObserver* observer) {}
 
 base::WeakPtr<syncer::JsController> FakeSyncService::GetJsController() {
   return base::WeakPtr<syncer::JsController>();
 }
 
 void FakeSyncService::GetAllNodes(
     const base::Callback<void(scoped_ptr<base::ListValue>)>& callback) {}
 
 }  // namespace sync_driver