Moves mash/wm into ash/mus

mash/wm/shadow_controller.h

-// Copyright 2015 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 MASH_WM_SHADOW_CONTROLLER_H_
-#define MASH_WM_SHADOW_CONTROLLER_H_
-
-#include "base/macros.h"
-#include "components/mus/public/cpp/window_observer.h"
-#include "components/mus/public/cpp/window_tree_client_observer.h"
-
-namespace mus {
-class WindowTreeClient;
-}
-
-namespace mash {
-namespace wm {
-
-class ShadowController : public mus::WindowTreeClientObserver,
-                         public mus::WindowObserver {
- public:
-  explicit ShadowController(mus::WindowTreeClient* window_tree);
-  ~ShadowController() override;
-
- private:
-  void SetActiveWindow(mus::Window* window);
-
-  // mus::WindowTreeClientObserver:
-  void OnWindowTreeFocusChanged(mus::Window* gained_focus,
-                                mus::Window* lost_focus) override;
-
-  // mus::WindowObserver:
-  void OnWindowDestroying(mus::Window* window) override;
-
-  mus::WindowTreeClient* window_tree_;
-  mus::Window* active_window_;
-
-  DISALLOW_COPY_AND_ASSIGN(ShadowController);
-};
-
-}  // namespace wm
-}  // namespace mash
-
-#endif  // MASH_WM_SHADOW_CONTROLLER_H_