mash: Move ShelfWindowWatcher[ItemDelegate] to ash/common.

ash/common/wm_shell.h

 // Copyright 2016 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_COMMON_WM_SHELL_H_
 #define ASH_COMMON_WM_SHELL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 23 matching lines @@
 class FocusCycler;
 class KeyboardBrightnessControlDelegate;
 class KeyboardUI;
 class MaximizeModeController;
 class MruWindowTracker;
 class NewWindowDelegate;
 class ScopedDisableInternalMouseAndKeyboard;
 class SessionStateDelegate;
 class ShelfDelegate;
 class ShelfModel;
+class ShelfWindowWatcher;
 class ShellDelegate;
 class ShellObserver;
 class SystemTrayDelegate;
 class SystemTrayNotifier;
 class ToastManager;
 class WindowCycleController;
 class WindowCycleEventFilter;
 class WindowResizer;
 class WindowSelectorController;
 class WmActivationObserver;
@@ skipping 287 matching lines @@
   std::unique_ptr<FocusCycler> focus_cycler_;
   std::unique_ptr<KeyboardBrightnessControlDelegate>
       keyboard_brightness_control_delegate_;
   std::unique_ptr<KeyboardUI> keyboard_ui_;
   std::unique_ptr<MaximizeModeController> maximize_mode_controller_;
   std::unique_ptr<MediaDelegate> media_delegate_;
   std::unique_ptr<MruWindowTracker> mru_window_tracker_;
   std::unique_ptr<NewWindowDelegate> new_window_delegate_;
   std::unique_ptr<ShelfDelegate> shelf_delegate_;
   std::unique_ptr<ShelfModel> shelf_model_;
+  std::unique_ptr<ShelfWindowWatcher> shelf_window_watcher_;
   std::unique_ptr<SystemTrayNotifier> system_tray_notifier_;
   std::unique_ptr<SystemTrayDelegate> system_tray_delegate_;
   std::unique_ptr<ToastManager> toast_manager_;
   std::unique_ptr<WindowCycleController> window_cycle_controller_;
   std::unique_ptr<WindowSelectorController> window_selector_controller_;
 
   base::ObserverList<LockStateObserver> lock_state_observers_;
 
   // See comment for GetRootWindowForNewWindows().
   WmWindow* root_window_for_new_windows_ = nullptr;
   WmWindow* scoped_root_window_for_new_windows_ = nullptr;
 
   bool simulate_modal_window_open_for_testing_ = false;
 
 #if defined(OS_CHROMEOS)
   std::unique_ptr<LogoutConfirmationController> logout_confirmation_controller_;
 #endif
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_SHELL_H_