2x Cursor support.

ui/aura/root_window.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_ROOT_WINDOW_H_
 #define UI_AURA_ROOT_WINDOW_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 241 matching lines @@
   virtual const RootWindow* GetRootWindow() const OVERRIDE;
   virtual void SetTransform(const ui::Transform& transform) OVERRIDE;
 
   // Overridden from ui::CompositorDelegate:
   virtual void ScheduleDraw() OVERRIDE;
 
   // Overridden from ui::CompositorObserver:
   virtual void OnCompositingStarted(ui::Compositor*) OVERRIDE;
   virtual void OnCompositingEnded(ui::Compositor*) OVERRIDE;
 
+  // Overridden from ui::LayerDelegate:
+  virtual void OnDeviceScaleFactorChanged(float device_scale_factor) OVERRIDE;
+
  private:
   friend class Window;
   friend class CompositorLock;
 
   // Called whenever the mouse moves, tracks the current |mouse_moved_handler_|,
   // sending exited and entered events as its value changes.
   void HandleMouseMoved(const MouseEvent& event, Window* target);
 
   // Called whenever the |capture_window_| changes.
   // Sends capture changed events to event filters for old capture window.
@@ skipping 133 matching lines @@
   bool draw_on_compositor_unlock_;
 
   int draw_trace_count_;
 
   DISALLOW_COPY_AND_ASSIGN(RootWindow);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_ROOT_WINDOW_H_