mash: Convert FocusCycler to wm common types and move to //ash/common

ash/mus/bridge/wm_window_mus.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_MUS_BRIDGE_WM_WINDOW_MUS_H_
 #define ASH_MUS_BRIDGE_WM_WINDOW_MUS_H_
 
 #include <memory>
 
 #include "ash/common/shell_window_ids.h"
@@ skipping 158 matching lines @@
   void SetRestoreShowState(ui::WindowShowState show_state) override;
   void SetLockedToRoot(bool value) override;
   void SetCapture() override;
   bool HasCapture() override;
   void ReleaseCapture() override;
   bool HasRestoreBounds() const override;
   void SetAlwaysOnTop(bool value) override;
   bool IsAlwaysOnTop() const override;
   void Hide() override;
   void Show() override;
+  views::Widget* GetWidget() override;
   void CloseWidget() override;
   bool IsFocused() const override;
   bool IsActive() const override;
   void Activate() override;
   void Deactivate() override;
   void SetFullscreen() override;
   void Maximize() override;
   void Minimize() override;
   void Unminimize() override;
   bool CanMaximize() const override;
@@ skipping 60 matching lines @@
   // resizing easier.
   bool children_use_extended_hit_region_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(WmWindowMus);
 };
 
 }  // namespace mus
 }  // namespace ash
 
 #endif  // ASH_MUS_BRIDGE_WM_WINDOW_MUS_H_