Implement notificationclose event

content/public/browser/notification_event_dispatcher.h

Index: content/public/browser/notification_event_dispatcher.h
diff --git a/content/public/browser/notification_event_dispatcher.h b/content/public/browser/notification_event_dispatcher.h
index bb3df945e2364e89cf3eb712087fe24ffe35b635..e84b9bc6e3bf3d37aebdebde2c793f7ba0ca64c6 100644
--- a/content/public/browser/notification_event_dispatcher.h
+++ b/content/public/browser/notification_event_dispatcher.h
@@ -41,6 +41,17 @@ class CONTENT_EXPORT NotificationEventDispatcher {
       const NotificationClickDispatchCompleteCallback&
           dispatch_complete_callback) = 0;
 
+  // Dispatches the "notificationclose" event on the Service Worker associated
+  // with |persistent_notification_id| belonging to |origin|. The |callback|
+  // will be invoked when it's known whether the event successfully executed.
+  virtual void DispatchNotificationCloseEvent(
+      BrowserContext* browser_context,
+      int64_t persistent_notification_id,
+      const GURL& origin,
+      const NotificationClickDispatchCompleteCallback&
+          dispatch_complete_callback) = 0;
+
+
  protected:
   virtual ~NotificationEventDispatcher() {}
 };