Move ash specific cursor code to CursorManager.

ui/aura/client/cursor_client.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 UI_AURA_CLIENT_CURSOR_CLIENT_H_
 #define UI_AURA_CLIENT_CURSOR_CLIENT_H_
 
 #include "ui/aura/aura_export.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace aura {
 class Window;
 namespace client {
 
 // An interface that receives cursor change events.
 class AURA_EXPORT CursorClient {
  public:
   // Notes that |window| has requested the change to |cursor|.
   virtual void SetCursor(gfx::NativeCursor cursor) = 0;
 
   // Changes the visibility of the cursor.
   virtual void ShowCursor(bool show) = 0;
 
   // Gets whether the cursor is visible.
   virtual bool IsCursorVisible() const = 0;
 
+  // Sets the device scale factor of the cursor.
+  virtual void SetDeviceScaleFactor(float scale_factor) = 0;
+
  protected:
   virtual ~CursorClient() {}
 };
 
 // Sets/Gets the activation client for the specified window.
 AURA_EXPORT void SetCursorClient(Window* window,
                                  CursorClient* client);
 AURA_EXPORT CursorClient* GetCursorClient(Window* window);
 
 }  // namespace client
 }  // namespace aura
 
 #endif  // UI_AURA_CLIENT_CURSOR_CLIENT_H_