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

chrome/browser/ui/views/infobars/translate_infobar_base.h

-// 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_INFOBARS_TRANSLATE_INFOBAR_BASE_H_
 #define CHROME_BROWSER_UI_VIEWS_INFOBARS_TRANSLATE_INFOBAR_BASE_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "chrome/browser/translate/languages_menu_model.h"
 #include "chrome/browser/translate/translate_infobar_view.h"
@@ skipping 26 matching lines @@
   // Sets the text of the provided language menu button to reflect the current
   // value from the delegate.
   void UpdateLanguageButtonText(views::MenuButton* button,
                                 LanguagesMenuModel::LanguageType language);
 
   // Convenience to retrieve the TranslateInfoBarDelegate for this infobar.
   TranslateInfoBarDelegate* GetDelegate();
 
  private:
   // InfoBarView:
-  virtual void OnPaintBackground(gfx::Canvas* canvas) OVERRIDE;
+  virtual void OnPaintBackground(gfx::CanvasSkia* canvas) OVERRIDE;
   virtual void AnimationProgressed(const ui::Animation* animation) OVERRIDE;
 
   // Returns the background that should be displayed when not animating.
   const views::Background& GetBackground();
 
   // Paints |background| to |canvas| with the opacity level based on
   // |animation_value|.
-  void FadeBackground(gfx::Canvas* canvas,
+  void FadeBackground(gfx::CanvasSkia* canvas,
                       double animation_value,
                       const views::Background& background);
 
   InfoBarBackground error_background_;
   scoped_ptr<ui::SlideAnimation> background_color_animation_;
 
   DISALLOW_COPY_AND_ASSIGN(TranslateInfoBarBase);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_INFOBARS_TRANSLATE_INFOBAR_BASE_H_