Reject the permissionState promise with NotSupported Exception (2/3)

chrome/browser/push_messaging/push_messaging_service_impl.cc

 // 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.
 
 #include "chrome/browser/push_messaging/push_messaging_service_impl.h"
 
 #include <vector>
 
 #include "base/barrier_closure.h"
 #include "base/bind.h"
@@ skipping 388 matching lines @@
     const GURL& embedding_origin,
     bool user_visible) {
   // TODO(peter): Consider |user_visible| when checking Push permission.
 
   PushMessagingPermissionContext* permission_context =
       PushMessagingPermissionContextFactory::GetForProfile(profile_);
   return ToPushPermission(permission_context->GetPermissionStatus(
       requesting_origin, embedding_origin));
 }
 
+bool PushMessagingServiceImpl::SupportNonVisibleMessages() {
+  return false;
+}
+
 void PushMessagingServiceImpl::RegisterEnd(
     const content::PushMessagingService::RegisterCallback& callback,
     const std::string& registration_id,
     content::PushRegistrationStatus status) {
   callback.Run(registration_id, status);
 }
 
 void PushMessagingServiceImpl::DidRegister(
     const PushMessagingAppIdentifier& app_identifier,
     const content::PushMessagingService::RegisterCallback& callback,
@@ skipping 221 matching lines @@
       CONTENT_SETTING_ALLOW;
 }
 
 gcm::GCMDriver* PushMessagingServiceImpl::GetGCMDriver() const {
   gcm::GCMProfileService* gcm_profile_service =
       gcm::GCMProfileServiceFactory::GetForProfile(profile_);
   CHECK(gcm_profile_service);
   CHECK(gcm_profile_service->driver());
   return gcm_profile_service->driver();
 }