Add support for Ash to Notifications

chrome/browser/notifications/notification_delegate.h

 // Copyright (c) 2011 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_DELEGATE_H_
 #define CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_DELEGATE_H_
 #pragma once
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
 
+namespace content {
+class RenderViewHost;
+}
+
 // Delegate for a notification. This class has two role, to implement
 // callback methods for notification, and provides an identify of
 // the associated notification.
 class NotificationDelegate
     : public base::RefCountedThreadSafe<NotificationDelegate> {
  public:
   // To be called when the desktop notification is actually shown.
   virtual void Display() = 0;
 
   // To be called when the desktop notification cannot be shown due to an
   // error.
   virtual void Error() = 0;
 
   // To be called when the desktop notification is closed.  If closed by a
   // user explicitly (as opposed to timeout/script), |by_user| should be true.
   virtual void Close(bool by_user) = 0;
 
   // To be called when a desktop notification is clicked.
   virtual void Click() = 0;
 
   // Returns unique id of the notification.
   virtual std::string id() const = 0;
 
+  // Returns the RenderViewHost that generated the notification, or NULL.
+  virtual content::RenderViewHost* GetRenderViewHost() const = 0;
+
  protected:
   virtual ~NotificationDelegate() {}
 
  private:
   friend class base::RefCountedThreadSafe<NotificationDelegate>;
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_DELEGATE_H_