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

chrome/browser/ui/views/tabs/dragged_tab_view.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_TABS_DRAGGED_TAB_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_TABS_DRAGGED_TAB_VIEW_H_
 #pragma once
 
 #include <vector>
 
 #include "build/build_config.h"
@@ skipping 22 matching lines @@
   // Sets the offset of the mouse from the upper left corner of the tab.
   void set_mouse_tab_offset(const gfx::Point& offset) {
     mouse_tab_offset_ = offset;
   }
 
   // Notifies the DraggedTabView that it should update itself.
   void Update();
 
  private:
   // Overridden from views::View:
-  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
+  virtual void OnPaint(gfx::CanvasSkia* canvas) OVERRIDE;
   virtual void Layout() OVERRIDE;
   virtual gfx::Size GetPreferredSize() OVERRIDE;
 
   // Paint the view, when it's not attached to any TabStrip.
-  void PaintDetachedView(gfx::Canvas* canvas);
+  void PaintDetachedView(gfx::CanvasSkia* canvas);
 
   // Paint the view, when "Show window contents while dragging" is disabled.
-  void PaintFocusRect(gfx::Canvas* canvas);
+  void PaintFocusRect(gfx::CanvasSkia* canvas);
 
   // Returns the preferred size of the container.
   gfx::Size PreferredContainerSize();
 
   // Utility for scaling a size by the current scaling factor.
   int ScaleValue(int value);
 
   // The window that contains the DraggedTabView.
   scoped_ptr<views::Widget> container_;
 
@@ skipping 19 matching lines @@
   // we are dragging.
   scoped_ptr<NativeViewPhotobooth> photobooth_;
 
   // Size of the TabContents being dragged.
   gfx::Size contents_size_;
 
   DISALLOW_COPY_AND_ASSIGN(DraggedTabView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TABS_DRAGGED_TAB_VIEW_H_