Fix accessability for web notification tray.

ash/system/tray/tray_bubble_view.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_TRAY_TRAY_BUBBLE_VIEW_H_
 #define ASH_SYSTEM_TRAY_TRAY_BUBBLE_VIEW_H_
 
 #include "ash/wm/shelf_types.h"
 #include "ui/aura/event_filter.h"
 #include "ui/views/bubble/bubble_delegate.h"
@@ skipping 27 matching lines @@
     // Set widget_ and tray_view_, set up animations, and show the bubble.
     // Must occur after bubble_view->CreateBubble() is called.
     void InitializeAndShowBubble(views::Widget* widget,
                                  TrayBubbleView* bubble_view,
                                  views::View* tray_view);
 
     virtual void BubbleViewDestroyed() = 0;
     virtual void OnMouseEnteredView() = 0;
     virtual void OnMouseExitedView() = 0;
     virtual void OnClickedOutsideView() = 0;
+    virtual string16 GetAccessibleName() = 0;
 
     // Overridden from aura::EventFilter.
     virtual bool PreHandleKeyEvent(aura::Window* target,
                                    ui::KeyEvent* event) OVERRIDE;
     virtual bool PreHandleMouseEvent(aura::Window* target,
                                      ui::MouseEvent* event) OVERRIDE;
     virtual ui::TouchStatus PreHandleTouchEvent(
         aura::Window* target,
         ui::TouchEvent* event) OVERRIDE;
     virtual ui::GestureStatus PreHandleGestureEvent(
@@ skipping 74 matching lines @@
   InitParams params_;
   Host* host_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayBubbleView);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_TRAY_BUBBLE_VIEW_H_