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

chrome/browser/services/gcm/push_messaging_service_impl.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_PUSH_MESSAGING_SERVICE_IMPL_H_
 #define CHROME_BROWSER_SERVICES_GCM_PUSH_MESSAGING_SERVICE_IMPL_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/weak_ptr.h"
 #include "components/gcm_driver/gcm_app_handler.h"
@@ skipping 39 matching lines @@
   bool CanHandle(const std::string& app_id) const override;
 
   // content::PushMessagingService implementation:
   GURL PushEndpoint() override;
   void RegisterFromDocument(
       const GURL& requesting_origin,
       int64 service_worker_registration_id,
       const std::string& sender_id,
       int renderer_id,
       int render_frame_id,
-      bool user_gesture,
+      bool user_visible_only,
       const content::PushMessagingService::RegisterCallback& callback) override;
   void RegisterFromWorker(
       const GURL& requesting_origin,
       int64 service_worker_registration_id,
       const std::string& sender_id,
       const content::PushMessagingService::RegisterCallback& callback) override;
   // TODO(mvanouwerkerk): Delete once the Push API flows through platform.
   // https://crbug.com/389194
   blink::WebPushPermissionStatus GetPermissionStatus(
       const GURL& requesting_origin,
@@ skipping 49 matching lines @@
   int push_registration_count_;
 
   base::WeakPtrFactory<PushMessagingServiceImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PushMessagingServiceImpl);
 };
 
 }  // namespace gcm
 
 #endif  // CHROME_BROWSER_SERVICES_GCM_PUSH_MESSAGING_SERVICE_IMPL_H_