Add a button on status bar to indicate that accessibility is enabled.

chrome/browser/chromeos/status/status_area_view.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_CHROMEOS_STATUS_STATUS_AREA_VIEW_H_
 #define CHROME_BROWSER_CHROMEOS_STATUS_STATUS_AREA_VIEW_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "chrome/browser/ui/views/accessible_pane_view.h"
 #include "views/view.h"
 
 namespace chromeos {
 
+class AccessibilityMenuButton;
 class CapsLockMenuButton;
 class ClockMenuButton;
 class InputMethodMenuButton;
 class MemoryMenuButton;
 class NetworkMenuButton;
 class PowerMenuButton;
 class StatusAreaHost;
 
 // This class is used to wrap the small informative widgets in the upper-right
 // of the window title bar. It is used on ChromeOS only.
 class StatusAreaView : public AccessiblePaneView {
  public:
   explicit StatusAreaView(StatusAreaHost* host);
   virtual ~StatusAreaView() {}
 
   virtual void Init();
   void MakeButtonsActive(bool active);
   void ButtonVisibilityChanged(views::View* button_view);
 
   // views::View* overrides.
   virtual gfx::Size GetPreferredSize();
   virtual void Layout();
   virtual void ChildPreferredSizeChanged(View* child);
 
+  AccessibilityMenuButton* accessibility_view() { return accessibility_view_; }
   CapsLockMenuButton* caps_lock_view() { return caps_lock_view_; }
   ClockMenuButton* clock_view() { return clock_view_; }
   InputMethodMenuButton* input_method_view() { return input_method_view_; }
   NetworkMenuButton* network_view() { return network_view_; }
   PowerMenuButton* power_view() { return power_view_; }
 
  private:
   StatusAreaHost* host_;
 
+  AccessibilityMenuButton* accessibility_view_;
   CapsLockMenuButton* caps_lock_view_;
   ClockMenuButton* clock_view_;
   InputMethodMenuButton* input_method_view_;
   MemoryMenuButton* memory_view_;
   NetworkMenuButton* network_view_;
   PowerMenuButton* power_view_;
 
   DISALLOW_COPY_AND_ASSIGN(StatusAreaView);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_STATUS_STATUS_AREA_VIEW_H_