Add a full screen virtual keyboard to virtual keyboard root window

ash/display/virtual_keyboard_window_controller.h

 // Copyright 2013 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_DISPLAY_VIRTUAL_KEYBOARD_WINDOW_CONTROLLER_H_
 #define ASH_DISPLAY_VIRTUAL_KEYBOARD_WINDOW_CONTROLLER_H_
 
 #include "ash/ash_export.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 
 namespace ash {
 
 namespace internal {
 class DisplayInfo;
 class RootWindowController;
 
 // This class maintains the RootWindowController dedicated for
 // virtual keyboard.
 class ASH_EXPORT VirtualKeyboardWindowController {
  public:
   VirtualKeyboardWindowController();
   virtual ~VirtualKeyboardWindowController();
 
+  RootWindowController* root_window_controller() {
+    return root_window_controller_.get();
+  }
+
   // Updates the root window's bounds using |display_info|.
   // Creates the new root window if one doesn't exist.
   void UpdateWindow(const DisplayInfo& display_info);
 
   // Close the mirror window.
   void Close();
 
  private:
   scoped_ptr<RootWindowController> root_window_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(VirtualKeyboardWindowController);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_DISPLAY_VIRTUAL_KEYBOARD_WINDOW_CONTROLLER_H_