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

components/sync_driver/fake_sync_service.h

 // 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.
 
 #ifndef COMPONENTS_SYNC_DRIVER_FAKE_SYNC_SERVICE_H_
 #define COMPONENTS_SYNC_DRIVER_FAKE_SYNC_SERVICE_H_
 
 #include <string>
 
 #include "components/sync_driver/sync_service.h"
@@ skipping 11 matching lines @@
 class FakeSyncService : public sync_driver::SyncService {
  public:
   FakeSyncService();
   ~FakeSyncService() override;
 
  private:
   // sync_driver::SyncService:
   bool HasSyncSetupCompleted() const override;
   bool IsSyncAllowed() const override;
   bool IsSyncActive() const override;
+  void TriggerRefresh(const syncer::ModelTypeSet& types) override;
   syncer::ModelTypeSet GetActiveDataTypes() const override;
   SyncClient* GetSyncClient() const override;
   void AddObserver(SyncServiceObserver* observer) override;
   void RemoveObserver(SyncServiceObserver* observer) override;
   bool HasObserver(const SyncServiceObserver* observer) const override;
   void OnDataTypeRequestsSyncStartup(syncer::ModelType type) override;
   bool CanSyncStart() const override;
   void RequestStop(
       sync_driver::SyncService::SyncStopDataFate data_fate) override;
   void RequestStart() override;
@@ skipping 52 matching lines @@
 
   GoogleServiceAuthError error_;
   GURL sync_service_url_;
   std::string unrecoverable_error_message_;
   scoped_ptr<syncer::UserShare> user_share_;
 };
 
 }  // namespace sync_driver
 
 #endif  // COMPONENTS_SYNC_DRIVER_FAKE_SYNC_SERVICE_H_