Implement notificationclose event

content/browser/notifications/notification_event_dispatcher_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 CONTENT_BROWSER_NOTIFICATIONS_NOTIFICATION_EVENT_DISPATCHER_IMPL_H_
 #define CONTENT_BROWSER_NOTIFICATIONS_NOTIFICATION_EVENT_DISPATCHER_IMPL_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
@@ skipping 10 matching lines @@
 
   // NotificationEventDispatcher implementation.
   void DispatchNotificationClickEvent(
       BrowserContext* browser_context,
       int64_t persistent_notification_id,
       const GURL& origin,
       int action_index,
       const NotificationClickDispatchCompleteCallback&
           dispatch_complete_callback) override;
 
+  void DispatchNotificationCloseEvent(
+      BrowserContext* browser_context,
+      int64_t persistent_notification_id,
+      const GURL& origin,
+      const NotificationClickDispatchCompleteCallback&
+          dispatch_complete_callback) override;
+
  private:
   NotificationEventDispatcherImpl();
   ~NotificationEventDispatcherImpl() override;
 
   friend struct base::DefaultSingletonTraits<NotificationEventDispatcherImpl>;
 
   DISALLOW_COPY_AND_ASSIGN(NotificationEventDispatcherImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_NOTIFICATIONS_NOTIFICATION_EVENT_DISPATCHER_IMPL_H_