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

ash/aura/wm_window_aura.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_AURA_WM_WINDOW_AURA_H_
 #define ASH_AURA_WM_WINDOW_AURA_H_
 
 #include "ash/ash_export.h"
 #include "ash/common/wm_window.h"
 #include "base/macros.h"
@@ skipping 110 matching lines @@
   bool CanResize() const override;
   bool CanActivate() const override;
   void StackChildAtTop(WmWindow* child) override;
   void StackChildAtBottom(WmWindow* child) override;
   void StackChildAbove(WmWindow* child, WmWindow* target) override;
   void StackChildBelow(WmWindow* child, WmWindow* target) 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;
   std::vector<WmWindow*> GetChildren() override;
@@ skipping 27 matching lines @@
   aura::Window* window_;
 
   base::ObserverList<WmWindowObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(WmWindowAura);
 };
 
 }  // namespace ash
 
 #endif  // ASH_AURA_WM_WINDOW_AURA_H_