Moves more code to ash/wm/common

ash/wm/always_on_top_controller.h

Index: ash/wm/always_on_top_controller.h
diff --git a/ash/wm/always_on_top_controller.h b/ash/wm/always_on_top_controller.h
deleted file mode 100644
index dac4cd30435e2fa7e4d9c946ae0d61c0477ff94e..0000000000000000000000000000000000000000
--- a/ash/wm/always_on_top_controller.h
+++ /dev/null
@@ -1,50 +0,0 @@
-// 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_WM_ALWAYS_ON_TOP_CONTROLLER_H_
-#define ASH_WM_ALWAYS_ON_TOP_CONTROLLER_H_
-
-#include <memory>
-
-#include "ash/ash_export.h"
-#include "ash/wm/common/wm_window_observer.h"
-#include "base/macros.h"
-
-namespace ash {
-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 wm::WmWindowObserver {
- public:
-  explicit AlwaysOnTopController(wm::WmWindow* viewport);
-  ~AlwaysOnTopController() override;
-
-  // Gets container for given |window| based on its "AlwaysOnTop" property.
-  wm::WmWindow* GetContainer(wm::WmWindow* window) const;
-
-  WorkspaceLayoutManager* GetLayoutManager() const;
-
-  void SetLayoutManagerForTest(
-      std::unique_ptr<WorkspaceLayoutManager> layout_manager);
-
- private:
-  // Overridden from wm::WmWindowObserver:
-  void OnWindowTreeChanged(wm::WmWindow* window,
-                           const TreeChangeParams& params) override;
-  void OnWindowPropertyChanged(wm::WmWindow* window,
-                               wm::WmWindowProperty property,
-                               intptr_t old) override;
-  void OnWindowDestroying(wm::WmWindow* window) override;
-
-  wm::WmWindow* always_on_top_container_;
-
-  DISALLOW_COPY_AND_ASSIGN(AlwaysOnTopController);
-};
-
-}  // namepsace ash
-
-#endif  // ASH_WM_ALWAYS_ON_TOP_CONTROLLER_H_