Push registration should read a "gcm_user_visible_only" key from the Manifest.

content/public/browser/push_messaging_service.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 CONTENT_PUBLIC_BROWSER_PUSH_MESSAGING_SERVICE_H_
 #define CONTENT_PUBLIC_BROWSER_PUSH_MESSAGING_SERVICE_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 12 matching lines @@
                               const std::string& /* registration_id */,
                               PushRegistrationStatus /* status */)>
       RegisterCallback;
 
   virtual ~PushMessagingService() {}
 
   // Register the given |sender_id| with GCM.
   virtual void Register(const GURL& origin,
                         int64 service_worker_registration_id,
                         const std::string& sender_id,
+                        bool user_visible_only,
                         int renderer_id,
                         int render_frame_id,
                         bool user_gesture,
                         const RegisterCallback& callback) = 0;
 
   // Check whether the requester has permission to register for Push
   // Messages
   virtual blink::WebPushPermissionStatus GetPermissionStatus(
       const GURL& requesting_origin,
       int renderer_id,
       int render_frame_id) = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_PUSH_MESSAGING_SERVICE_H_