Implement device token fetcher

chrome/common/net/gaia/gaia_constants.cc

 // Copyright (c) 2010 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.
 //
 // Constants definitions
 
 #include "chrome/common/net/gaia/gaia_constants.h"
 
 namespace GaiaConstants {
 
 // Gaia uses this for accounting where login is coming from.
 const char kChromeOSSource[] = "chromeos";
 const char kChromeSource[] = "ChromiumBrowser";
 
 // Service name for Gaia Contacts API. API is used to get user's image.
 const char kContactsService[] = "cp";
 // Service name for sync.
 const char kSyncService[] = "chromiumsync";
 // Service name for XMPP Google Talk.
 const char kTalkService[] = "talk";
 // Service name for remoting.
 const char kRemotingService[] = "chromoting";
 // Service name for cloud print.
 const char kCloudPrintService[] = "cloudprint";
+// Service name for device management (cloud-based policy) server.
+const char kDeviceManagementService[] = "mobilesync";
 
 }  // namespace GaiaConstants