ui/gfx: Make gfx::Canvas inherit from gfx::CanvasSkia.

ui/views/controls/glow_hover_controller.h

Index: ui/views/controls/glow_hover_controller.h
diff --git a/ui/views/controls/glow_hover_controller.h b/ui/views/controls/glow_hover_controller.h
index 69aeecf59cdf6cc9dd1f0a917960b69c9b5d6e28..fc9321d639ea75ef4c60cdaf8c6d752dd9622bfa 100644
--- a/ui/views/controls/glow_hover_controller.h
+++ b/ui/views/controls/glow_hover_controller.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -11,7 +11,7 @@
 #include "ui/views/views_export.h"
 
 namespace gfx {
-class Canvas;
+class CanvasSkia;
 class Point;
 }
 
@@ -59,7 +59,7 @@ class VIEWS_EXPORT GlowHoverController : public ui::AnimationDelegate {
 
   // If the hover is currently visible it is drawn to the supplied canvas.
   // |mask_image| is used to determine what parts of the canvas to draw on.
-  void Draw(gfx::Canvas* canvas, const SkBitmap& mask_image) const;
+  void Draw(gfx::CanvasSkia* canvas, const SkBitmap& mask_image) const;
 
   // ui::AnimationDelegate overrides:
   virtual void AnimationEnded(const ui::Animation* animation) OVERRIDE;