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

ui/views/controls/throbber.h

Index: ui/views/controls/throbber.h
diff --git a/ui/views/controls/throbber.h b/ui/views/controls/throbber.h
index 28ead3179224f2c4edbf8856328c981c3086436b..b10e2bda24a6c8bd7ec2ac95c6c63287e1591c99 100644
--- a/ui/views/controls/throbber.h
+++ b/ui/views/controls/throbber.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.
 
@@ -37,7 +37,7 @@ class VIEWS_EXPORT Throbber : public View {
 
   // overridden from View
   virtual gfx::Size GetPreferredSize() OVERRIDE;
-  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
+  virtual void OnPaint(gfx::CanvasSkia* canvas) OVERRIDE;
 
  protected:
   // Specifies whether the throbber is currently animating or not
@@ -107,7 +107,7 @@ class VIEWS_EXPORT CheckmarkThrobber : public Throbber {
   void SetChecked(bool checked);
 
   // Overridden from Throbber:
-  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
+  virtual void OnPaint(gfx::CanvasSkia* canvas) OVERRIDE;
 
  private:
   static const int kFrameTimeMs = 30;