Push API: Grace - allow one in ten pushes to show no notification.

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 69 matching lines @@
 
   void DeliverMessageCallback(const PushMessagingApplicationId& application_id,
                               const GCMClient::IncomingMessage& message,
                               content::PushDeliveryStatus status);
 
   // Developers are required to display a Web Notification in response to an
   // incoming push message in order to clarify to the user that something has
   // happened in the background. When they forget to do so, display a default
   // notification on their behalf.
   void RequireUserVisibleUX(const PushMessagingApplicationId& application_id);
+  void DidGetNotificationsShown(
+      const PushMessagingApplicationId& application_id,
+      bool notification_shown,
+      bool notification_needed,
+      const std::string& data,
+      bool success,
+      bool not_found);
 
   void RegisterEnd(
       const content::PushMessagingService::RegisterCallback& callback,
       const std::string& registration_id,
       content::PushRegistrationStatus status);
 
   void DidRegister(
       const content::PushMessagingService::RegisterCallback& callback,
       const std::string& registration_id,
       GCMClient::Result result);
@@ skipping 24 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_