Add an action for server to send down rollback command.

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 <set>
 #include <utility>
@@ skipping 1323 matching lines @@
       if (!startup_controller_.auto_start_enabled())
         SigninManagerFactory::GetForProfile(profile_)->SignOut();
 #endif
       break;
     case syncer::STOP_SYNC_FOR_DISABLED_ACCOUNT:
       // Sync disabled by domain admin. we should stop syncing until next
       // restart.
       sync_disabled_by_admin_ = true;
       ShutdownImpl(browser_sync::SyncBackendHost::DISABLE_AND_CLAIM_THREAD);
       break;
+    case syncer::DISABLE_SYNC_AND_ROLLBACK:
+      NOTIMPLEMENTED();
+      break;
     default:
       NOTREACHED();
   }
   NotifyObservers();
 }
 
 void ProfileSyncService::OnConfigureDone(
     const browser_sync::DataTypeManager::ConfigureResult& result) {
   // We should have cleared our cached passphrase before we get here (in
   // OnBackendInitialized()).
@@ skipping 1000 matching lines @@
   status.last_get_token_error = last_get_token_error_;
   if (request_access_token_retry_timer_.IsRunning())
     status.next_token_request_time = next_token_request_time_;
   return status;
 }
 
 void ProfileSyncService::OverrideNetworkResourcesForTest(
     scoped_ptr<syncer::NetworkResources> network_resources) {
   network_resources_ = network_resources.Pass();
 }