Implement cancel() API on a Notification object so that script can cancel or ...

chrome/browser/notifications/desktop_notification_service.h

 // Copyright (c) 2009 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_NOTIFICATIONS_DESKTOP_NOTIFICATION_SERVICE_H_
 #define CHROME_BROWSER_NOTIFICATIONS_DESKTOP_NOTIFICATION_SERVICE_H_
 
 #include <set>
 
 #include "base/basictypes.h"
@@ skipping 34 matching lines @@
   // script is in a worker or page.  |notification_id| is an opaque
   // value to be passed back to the process when events occur on
   // this notification.
   bool ShowDesktopNotification(const GURL& origin, const GURL& url,
       int process_id, int route_id, NotificationSource source,
       int notification_id);
   bool ShowDesktopNotificationText(const GURL& origin, const GURL& icon,
       const string16& title, const string16& text, int process_id,
       int route_id, NotificationSource source, int notification_id);
 
+  // Cancels a notification.  If it has already been shown, it will be
+  // removed from the screen.  If it hasn't been shown yet, it won't be
+  // shown.
+  bool CancelDesktopNotification(int process_id,
+                                 int route_id,
+                                 int notification_id);
+
   // Methods to setup and modify permission preferences.
   void GrantPermission(const GURL& origin);
   void DenyPermission(const GURL& origin);
 
   NotificationsPrefsCache* prefs_cache() { return prefs_cache_; }
 
  private:
   void InitPrefs();
 
   // The profile which owns this object.
   Profile* profile_;
 
   // A cache of preferences which is accessible only on the IO thread
   // to service synchronous IPCs.
   scoped_refptr<NotificationsPrefsCache> prefs_cache_;
 
   // Non-owned pointer to the notification manager which manages the
   // UI for desktop toasts.
   NotificationUIManager* ui_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopNotificationService);
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_DESKTOP_NOTIFICATION_SERVICE_H_