Enable virtual keyboard in overview mode

ash/shell.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_SHELL_H_
 #define ASH_SHELL_H_
 
 #include <utility>
 #include <vector>
 
@@ skipping 123 matching lines @@
 class SystemGestureEventFilter;
 class SystemModalContainerEventFilter;
 class SystemTray;
 class SystemTrayDelegate;
 class SystemTrayNotifier;
 class ToplevelWindowEventHandler;
 class TouchTransformerController;
 class TouchObserverHUD;
 class UserActivityDetector;
 class UserWallpaperDelegate;
+class VirtualKeyboardController;
 class VideoActivityNotifier;
 class VideoDetector;
 class WebNotificationTray;
 class WindowCycleController;
 class WindowPositioner;
 class WindowSelectorController;
 
 namespace shell {
 class WindowWatcher;
 }
@@ skipping 505 matching lines @@
   scoped_ptr<DesktopBackgroundController> desktop_background_controller_;
   scoped_ptr<PowerButtonController> power_button_controller_;
   scoped_ptr<LockStateController> lock_state_controller_;
   scoped_ptr<MruWindowTracker> mru_window_tracker_;
   scoped_ptr< ::wm::UserActivityDetector> user_activity_detector_;
   scoped_ptr<VideoDetector> video_detector_;
   scoped_ptr<WindowCycleController> window_cycle_controller_;
   scoped_ptr<WindowSelectorController> window_selector_controller_;
   scoped_ptr<FocusCycler> focus_cycler_;
   scoped_ptr<DisplayController> display_controller_;
+  scoped_ptr<VirtualKeyboardController> virtual_keyboard_controller_;
   scoped_ptr<HighContrastController> high_contrast_controller_;
   scoped_ptr<MagnificationController> magnification_controller_;
   scoped_ptr<PartialMagnificationController> partial_magnification_controller_;
   scoped_ptr<AutoclickController> autoclick_controller_;
   scoped_ptr<aura::client::FocusClient> focus_client_;
   aura::client::ActivationClient* activation_client_;
 
   scoped_ptr<MouseCursorEventFilter> mouse_cursor_filter_;
   scoped_ptr<ScreenPositionController> screen_position_controller_;
   scoped_ptr<SystemModalContainerEventFilter> modality_filter_;
@@ skipping 78 matching lines @@
 
   // Injected content::GPUDataManager support.
   scoped_ptr<GPUSupport> gpu_support_;
 
   DISALLOW_COPY_AND_ASSIGN(Shell);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_H_