Fixed non-speaking Sign out buttons.

ash/system/logout_button/tray_logout_button.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/logout_button/tray_logout_button.h"
 
 #include <cstddef>
 
 #include "ash/shell.h"
 #include "ash/system/tray/system_tray_delegate.h"
@@ skipping 68 matching lines @@
     border->SetImages(views::CustomButton::STATE_HOVERED,
                       views::BorderImages(kLogoutButtonBorderHotImages));
     border->SetImages(views::CustomButton::STATE_PRESSED,
                       views::BorderImages(kLogoutButtonBorderPushedImages));
     set_border(border);
     OnLoginStatusChanged(status);
   }
 
   void OnLoginStatusChanged(user::LoginStatus status) {
     login_status_ = status;
-    SetText(GetLocalizedSignOutStringForStatus(login_status_, false));
+    const string16 title = GetLocalizedSignOutStringForStatus(login_status_,
+                                                              false);
+    SetText(title);
+    SetAccessibleName(title);
     UpdateVisibility();
   }
 
   void OnShowLogoutButtonInTrayChanged(bool show) {
     show_logout_button_in_tray_ = show;
     UpdateVisibility();
   }
 
   // Overridden from views::ButtonListener.
   void ButtonPressed(views::Button* sender, const ui::Event& event) OVERRIDE {
@@ skipping 34 matching lines @@
 void TrayLogoutButton::UpdateAfterLoginStatusChange(user::LoginStatus status) {
   logout_button_->OnLoginStatusChanged(status);
 }
 
 void TrayLogoutButton::OnShowLogoutButtonInTrayChanged(bool show) {
   logout_button_->OnShowLogoutButtonInTrayChanged(show);
 }
 
 }  // namespace internal
 }  // namespace ash