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

chrome/browser/sync/profile_sync_service.cc

 // Copyright (c) 2012 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/profile_sync_service.h"
 
 #include <cstddef>
 #include <map>
 #include <vector>
 
@@ skipping 1669 matching lines @@
 
 bool ProfileSyncService::IsSyncAllowed() const {
   return IsSyncAllowedByFlag() && !IsManaged();
 }
 
 bool ProfileSyncService::IsSyncActive() const {
   return backend_initialized_ && backend_mode_ == SYNC && data_type_manager_ &&
          data_type_manager_->state() != DataTypeManager::STOPPED;
 }
 
+void ProfileSyncService::TriggerRefresh(const syncer::ModelTypeSet& types) {
+  if (backend_initialized_)
+    backend_->TriggerRefresh(types);
+}
+
 bool ProfileSyncService::IsSignedIn() const {
   // Sync is logged in if there is a non-empty effective account id.
   return !signin_->GetAccountIdToUse().empty();
 }
 
 bool ProfileSyncService::IsBackendInitialized() const {
   return backend_initialized_;
 }
 
 ProfileSyncService::BackendMode ProfileSyncService::backend_mode() const {
@@ skipping 1033 matching lines @@
 }
 
 std::string ProfileSyncService::unrecoverable_error_message() const {
   return unrecoverable_error_message_;
 }
 
 tracked_objects::Location ProfileSyncService::unrecoverable_error_location()
     const {
   return unrecoverable_error_location_;
 }