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

chrome/browser/sync/glue/sync_backend_host_mock.cc

 // 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.
 
 #include "chrome/browser/sync/glue/sync_backend_host_mock.h"
 
 #include "components/sync_driver/sync_frontend.h"
 #include "sync/internal_api/public/activation_context.h"
 
 namespace browser_sync {
@@ skipping 19 matching lines @@
     const base::Closure& report_unrecoverable_error_function,
     syncer::NetworkResources* network_resources,
     scoped_ptr<syncer::SyncEncryptionHandler::NigoriState> saved_nigori_state) {
   frontend->OnBackendInitialized(
       syncer::WeakHandle<syncer::JsBackend>(),
       syncer::WeakHandle<syncer::DataTypeDebugInfoListener>(),
       kTestCacheGuid,
       !fail_initial_download_);
 }
 
+void SyncBackendHostMock::TriggerRefresh(const syncer::ModelTypeSet& types) {}
+
 void SyncBackendHostMock::UpdateCredentials(
     const syncer::SyncCredentials& credentials) {}
 
 void SyncBackendHostMock::StartSyncingWithServer() {}
 
 void SyncBackendHostMock::SetEncryptionPassphrase(
     const std::string& passphrase,
     bool is_explicit) {}
 
 bool SyncBackendHostMock::SetDecryptionPassphrase(
@@ skipping 95 matching lines @@
 void SyncBackendHostMock::set_fail_initial_download(bool should_fail) {
   fail_initial_download_ = should_fail;
 }
 
 void SyncBackendHostMock::ClearServerData(
     const syncer::SyncManager::ClearServerDataCallback& callback) {
   callback.Run();
 }
 
 }  // namespace browser_sync