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

chrome/browser/notifications/notification_object_proxy.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_NOTIFICATION_OBJECT_PROXY_H_
 #define CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_OBJECT_PROXY_H_
 
 #include "base/ref_counted.h"
 
 class MessageLoop;
@@ skipping 13 matching lines @@
                           int notification_id, bool worker);
 
   // To be called when the desktop notification is actually shown.
   void Display();
 
   // To be called when the desktop notification cannot be shown due to an
   // error.
   void Error();
 
   // To be called when the desktop notification is closed.  If closed by a
-  // user explicitly (as opposed to timeout), |by_user| should be true.
+  // user explicitly (as opposed to timeout/script), |by_user| should be true. q
   void Close(bool by_user);
 
+  // Compares two proxies by ids to decide if they are equal.
+  bool IsSame(const NotificationObjectProxy& other) const {
+    return (notification_id_ == other.notification_id_ &&
+            route_id_ == other.route_id_ &&
+            process_id_ == other.process_id_ &&
+            worker_ == other.worker_);
+  }
+
  private:
   // Called on UI thread to schedule a message for sending.
   void DeliverMessage(IPC::Message* message);
 
   // Called via Task on IO thread to actually send a message to a notification.
   void Send(IPC::Message* message);
 
   // Callback information to find the JS Notification object where it lives.
   int process_id_;
   int route_id_;
   int notification_id_;
   bool worker_;
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_OBJECT_PROXY_H_