Add a11y on-screen keyboard to accessibility menu on system tray.

ash/system/tray_accessibility.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_ACCESSIBILITY_H_
 #define ASH_SYSTEM_TRAY_ACCESSIBILITY_H_
 
 #include "ash/accessibility_delegate.h"
 #include "ash/shell_observer.h"
 #include "ash/system/tray/tray_details_view.h"
@@ skipping 59 matching lines @@
   virtual void ButtonPressed(views::Button* sender,
                              const ui::Event& event) OVERRIDE;
 
   views::View* spoken_feedback_view_;
   views::View* high_contrast_view_;
   views::View* screen_magnifier_view_;;
   views::View* large_cursor_view_;;
   views::View* help_view_;
   views::View* settings_view_;
   views::View* autoclick_view_;
+  views::View* virtual_keyboard_view_;
 
   bool spoken_feedback_enabled_;
   bool high_contrast_enabled_;
   bool screen_magnifier_enabled_;
   bool large_cursor_enabled_;
   bool autoclick_enabled_;
+  bool virtual_keyboard_enabled_;
   user::LoginStatus login_;
 
   friend class chromeos::TrayAccessibilityTest;
   DISALLOW_COPY_AND_ASSIGN(AccessibilityDetailedView);
 };
 
 }  // namespace tray
 
 class TrayAccessibility : public TrayImageItem,
                           public AccessibilityObserver {
@@ skipping 32 matching lines @@
   bool show_a11y_menu_on_lock_screen_;
 
   friend class chromeos::TrayAccessibilityTest;
   DISALLOW_COPY_AND_ASSIGN(TrayAccessibility);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_ACCESSIBILITY_H_