Use a single ToplevelWindowEventHandler for the ash::Shell

ash/root_window_controller.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_ROOT_WINDOW_CONTROLLER_H_
 #define ASH_ROOT_WINDOW_CONTROLLER_H_
 
 #include <map>
 
 #include "ash/ash_export.h"
@@ skipping 24 matching lines @@
 class InputMethodEventFilter;
 class RootWindowEventFilter;
 class ScopedCaptureClient;
 }
 }
 
 namespace keyboard {
 class KeyboardController;
 }
 
+namespace ui {
+class EventHandler;
+}
+
 namespace ash {
 class ShelfWidget;
 class SoloWindowTracker;
 class StackingController;
 class SystemTray;
 class ToplevelWindowEventHandler;
 
 namespace internal {
 
 class AlwaysOnTopController;
@@ skipping 237 matching lines @@
 
   scoped_ptr<ScreenDimmer> screen_dimmer_;
   scoped_ptr<WorkspaceController> workspace_controller_;
   scoped_ptr<AlwaysOnTopController> always_on_top_controller_;
 
   // Heads-up displays for touch events. These HUDs are not owned by the root
   // window controller and manage their own lifetimes.
   TouchHudDebug* touch_hud_debug_;
   TouchHudProjection* touch_hud_projection_;
 
-  // We need to own event handlers for various containers.
-  scoped_ptr<ToplevelWindowEventHandler> default_container_handler_;
-  scoped_ptr<ToplevelWindowEventHandler> always_on_top_container_handler_;
-  scoped_ptr<ToplevelWindowEventHandler> modal_container_handler_;
-  scoped_ptr<ToplevelWindowEventHandler> lock_modal_container_handler_;
-  scoped_ptr<ToplevelWindowEventHandler> panel_container_handler_;
-  scoped_ptr<ToplevelWindowEventHandler> docked_container_handler_;
+  // Handles events for the panel container.
+  scoped_ptr<ui::EventHandler> panel_container_handler_;
 
   scoped_ptr<DesktopBackgroundWidgetController> wallpaper_controller_;
   scoped_ptr<AnimatingDesktopController> animating_wallpaper_controller_;
   scoped_ptr<views::corewm::ScopedCaptureClient> capture_client_;
   scoped_ptr<SoloWindowTracker> solo_window_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(RootWindowController);
 };
 
 
 // Gets the RootWindowController for |root_window|.
 ASH_EXPORT RootWindowController* GetRootWindowController(
     const aura::Window* root_window);
 
 }  // namespace internal
 }  // ash
 
 #endif  //  ASH_ROOT_WINDOW_CONTROLLER_H_