chromeos: Move files in //ash/common to //ash, part 2

ash/common/wm/always_on_top_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_COMMON_WM_ALWAYS_ON_TOP_CONTROLLER_H_
-#define ASH_COMMON_WM_ALWAYS_ON_TOP_CONTROLLER_H_
-
-#include <memory>
-
-#include "ash/ash_export.h"
-#include "base/macros.h"
-#include "ui/aura/window_observer.h"
-
-namespace ash {
-
-class WmWindow;
-class WorkspaceLayoutManager;
-
-// AlwaysOnTopController puts window into proper containers based on its
-// 'AlwaysOnTop' property. That is, putting a window into the worskpace
-// container if its "AlwaysOnTop" property is false. Otherwise, put it in
-// |always_on_top_container_|.
-class ASH_EXPORT AlwaysOnTopController : public aura::WindowObserver {
- public:
-  explicit AlwaysOnTopController(WmWindow* viewport);
-  ~AlwaysOnTopController() override;
-
-  // Gets container for given |window| based on its "AlwaysOnTop" property.
-  WmWindow* GetContainer(WmWindow* window) const;
-
-  WorkspaceLayoutManager* GetLayoutManager() const;
-
-  void SetLayoutManagerForTest(
-      std::unique_ptr<WorkspaceLayoutManager> layout_manager);
-
- private:
-  // Overridden from aura::WindowObserver:
-  void OnWindowHierarchyChanged(const HierarchyChangeParams& params) override;
-  void OnWindowPropertyChanged(aura::Window* window,
-                               const void* key,
-                               intptr_t old) override;
-  void OnWindowDestroying(aura::Window* window) override;
-
-  WmWindow* always_on_top_container_;
-
-  DISALLOW_COPY_AND_ASSIGN(AlwaysOnTopController);
-};
-
-}  // namepsace ash
-
-#endif  // ASH_COMMON_WM_ALWAYS_ON_TOP_CONTROLLER_H_