Fix accessability for web notification tray.

ash/system/tray/system_tray_bubble.cc

 // 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.
 
 #include "ash/system/tray/system_tray_bubble.h"
 
 #include "ash/shell.h"
 #include "ash/system/tray/system_tray.h"
 #include "ash/system/tray/system_tray_delegate.h"
 #include "ash/system/tray/system_tray_item.h"
@@ skipping 315 matching lines @@
 void SystemTrayBubble::OnMouseExitedView() {
   RestartAutoCloseTimer();
   tray_->UpdateShouldShowLauncher();
 }
 
 void SystemTrayBubble::OnClickedOutsideView() {
   if (bubble_type_ != BUBBLE_TYPE_NOTIFICATION)
     bubble_widget_->Close();
 }
 
+string16 SystemTrayBubble::GetAccessibleName() {
+  return tray_->GetAccessibleName();
+}
+
 void SystemTrayBubble::DestroyItemViews() {
   for (std::vector<ash::SystemTrayItem*>::iterator it = items_.begin();
        it != items_.end();
        ++it) {
     switch (bubble_type_) {
       case BUBBLE_TYPE_DEFAULT:
         (*it)->DestroyDefaultView();
         break;
       case BUBBLE_TYPE_DETAILED:
         (*it)->DestroyDetailedView();
@@ skipping 66 matching lines @@
 }
 
 void SystemTrayBubble::OnWidgetClosing(views::Widget* widget) {
   CHECK_EQ(bubble_widget_, widget);
   bubble_widget_ = NULL;
   tray_->RemoveBubble(this);
 }
 
 }  // namespace internal
 }  // namespace ash