Reland: Add GCMChannelStatusSyncer to schedule requests and enable/disable GCM

chrome/browser/services/gcm/gcm_desktop_utils.h

 // Copyright 2014 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 CHROME_BROWSER_SERVICES_GCM_GCM_DESKTOP_UTILS_H_
 #define CHROME_BROWSER_SERVICES_GCM_GCM_DESKTOP_UTILS_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 
+class PrefService;
 namespace base {
 class FilePath;
 }
 
 namespace net {
 class URLRequestContextGetter;
 }
 
 namespace gcm {
 
 class GCMDriver;
 class GCMClientFactory;
 
 scoped_ptr<GCMDriver> CreateGCMDriverDesktop(
     scoped_ptr<GCMClientFactory> gcm_client_factory,
+    PrefService* prefs,
     const base::FilePath& store_path,
     const scoped_refptr<net::URLRequestContextGetter>& request_context);
 
 }  // namespace gcm
 
 #endif  // CHROME_BROWSER_SERVICES_GCM_GCM_DESKTOP_UTILS_H_