Places the unread count in the middle of web notification tray button.

ash/system/web_notification/web_notification_tray.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 ASH_SYSTEM_WEB_NOTIFICATION_WEB_NOTIFICATION_TRAY_H_
 #define ASH_SYSTEM_WEB_NOTIFICATION_WEB_NOTIFICATION_TRAY_H_
 
 #include "ash/ash_export.h"
 #include "ash/system/tray/tray_background_view.h"
 #include "ash/system/user/login_status.h"
@@ skipping 23 matching lines @@
 class MessageCenterBubble;
 class MessagePopupBubble;
 class MessagePopupCollection;
 }
 
 namespace ash {
 
 namespace internal {
 class StatusAreaWidget;
 class WebNotificationBubbleWrapper;
+class WebNotificationButton;
 }
 
 class ASH_EXPORT WebNotificationTray
     : public internal::TrayBackgroundView,
       public views::TrayBubbleView::Delegate,
       public message_center::MessageCenterTrayDelegate,
       public views::ButtonListener {
  public:
   explicit WebNotificationTray(
       internal::StatusAreaWidget* status_area_widget);
@@ skipping 81 matching lines @@
   // Testing accessors.
   bool IsPopupVisible() const;
   message_center::MessageCenterBubble* GetMessageCenterBubbleForTest();
   message_center::MessagePopupBubble* GetPopupBubbleForTest();
 
   scoped_ptr<message_center::MessageCenterTray> message_center_tray_;
   scoped_ptr<internal::WebNotificationBubbleWrapper> message_center_bubble_;
   scoped_ptr<internal::WebNotificationBubbleWrapper> popup_bubble_;
   scoped_ptr<message_center::MessagePopupCollection> popup_collection_;
   scoped_ptr<views::MenuRunner> quiet_mode_menu_runner_;
-  views::ImageButton* button_;
+  internal::WebNotificationButton* button_;
 
   bool show_message_center_on_unlock_;
 
   DISALLOW_COPY_AND_ASSIGN(WebNotificationTray);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_WEB_NOTIFICATION_WEB_NOTIFICATION_TRAY_H_