Use a single ToplevelWindowEventHandler for the ash::Shell

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 87 matching lines @@
 class Shelf;
 class ShelfDelegate;
 class ShelfItemDelegateManager;
 class ShelfModel;
 class ShellDelegate;
 class ShellObserver;
 class StickyKeys;
 class SystemTray;
 class SystemTrayDelegate;
 class SystemTrayNotifier;
+class ToplevelWindowEventHandler;
 class UserActivityDetector;
 class UserWallpaperDelegate;
 class VideoDetector;
 class WebNotificationTray;
 class WindowCycleController;
 class WindowPositioner;
 class WindowSelectorController;
 
 namespace internal {
 class AcceleratorFilter;
@@ skipping 530 matching lines @@
   // An event filter that rewrites or drops an event.
   scoped_ptr<internal::EventRewriterEventFilter> event_rewriter_filter_;
 
   // An event filter that pre-handles key events while the partial
   // screenshot UI or the keyboard overlay is active.
   scoped_ptr<internal::OverlayEventFilter> overlay_filter_;
 
   // An event filter for logging keyboard-related metrics.
   scoped_ptr<internal::KeyboardUMAEventFilter> keyboard_metrics_filter_;
 
+  // An event filter which handles moving and resizing windows.
+  scoped_ptr<ToplevelWindowEventHandler> toplevel_window_event_handler_;
+
   // An event filter which handles system level gestures
   scoped_ptr<internal::SystemGestureEventFilter> system_gesture_filter_;
 
   // An event filter that pre-handles global accelerators.
   scoped_ptr<internal::AcceleratorFilter> accelerator_filter_;
 
   // An event filter that pre-handles all key events to send them to an IME.
   scoped_ptr<views::corewm::InputMethodEventFilter> input_method_filter_;
 
   scoped_ptr<internal::DisplayManager> display_manager_;
@@ skipping 34 matching lines @@
   bool simulate_modal_window_open_for_testing_;
 
   bool is_touch_hud_projection_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(Shell);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_H_