Allow partial update for notification update API

chrome/browser/notifications/notification.h

 // Copyright (c) 2012 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_H_
 #define CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
 #include "base/values.h"
 #include "chrome/browser/notifications/notification_delegate.h"
 #include "third_party/WebKit/public/web/WebTextDirection.h"
 #include "ui/gfx/image/image.h"
 #include "ui/message_center/notification.h"
 #include "ui/message_center/notification_types.h"
 #include "url/gurl.h"
 
 // Representation of a notification to be shown to the user.
 // On non-Ash platforms these are rendered as HTML, sometimes described by a
 // data url converted from text + icon data. On Ash they are rendered as
 // formated text and icon data.
 class Notification : public message_center::Notification {
  public:
+  Notification();

[dewittj, 2013/07/24 23:09:53]

I don't love this, since it creates an invalid notification.  Can we return a
pointer to the current Notification in the list from DoesIdExist and make a copy
of it in the calling code?  Or return a scoped_ptr<Notification> from
DoesIdExist that contains new Notification(currentNotification)?

[jianli, 2013/07/25 01:02:41]

Removed.

+
   // Initializes a notification with HTML content.
   Notification(const GURL& origin_url,
                const GURL& content_url,
                const string16& display_source,
                const string16& replace_id,
                NotificationDelegate* delegate);
 
   // Initializes a notification with text content. On non-ash platforms, this
   // creates an HTML representation using a data: URL for display.
   Notification(const GURL& origin_url,
@@ skipping 89 matching lines @@
 
   // The user-supplied replace ID for the notification.
   string16 replace_id_;
 
   // A proxy object that allows access back to the JavaScript object that
   // represents the notification, for firing events.
   scoped_refptr<NotificationDelegate> delegate_;
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_H_