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

ui/views/window/frame_background.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 UI_VIEWS_WINDOW_FRAME_BACKGROUND_H_
 #define UI_VIEWS_WINDOW_FRAME_BACKGROUND_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/views/views_export.h"
 
 class SkBitmap;
 namespace gfx {
-class Canvas;
+class CanvasSkia;
 }
 
 namespace views {
 
 class View;
 
 // FrameBackground handles painting for all the various window frames we
 // support in Chrome. It intends to consolidate paint code that historically
 // was copied. One frame to rule them all!
 class VIEWS_EXPORT FrameBackground {
@@ skipping 43 matching lines @@
   // windows.  Use 0 and NULL if you don't want special corners.
   // TODO(jamescook): This is the remnant of a ChromeOS window hack, and should
   // be removed.
   void SetMaximizedCorners(SkBitmap* top_left,
                            SkBitmap* top_right,
                            int top_offset);
 
   // Paints the border for a standard, non-maximized window.  Also paints the
   // background of the title bar area, since the top frame border and the
   // title bar background are a contiguous component.
-  void PaintRestored(gfx::Canvas* canvas, View* view) const;
+  void PaintRestored(gfx::CanvasSkia* canvas, View* view) const;
 
   // Paints the border for a maximized window, which does not include the
   // window edges.
-  void PaintMaximized(gfx::Canvas* canvas, View* view) const;
+  void PaintMaximized(gfx::CanvasSkia* canvas, View* view) const;
 
  private:
   // Fills the frame area with the frame color.
-  void PaintFrameColor(gfx::Canvas* canvas, View* view) const;
+  void PaintFrameColor(gfx::CanvasSkia* canvas, View* view) const;
 
   SkColor frame_color_;
   SkBitmap* theme_bitmap_;
   SkBitmap* theme_overlay_bitmap_;
   int top_area_height_;
 
   // Images for the sides of the frame.
   SkBitmap* left_edge_;
   SkBitmap* top_edge_;
   SkBitmap* right_edge_;
@@ skipping 11 matching lines @@
   SkBitmap* maximized_top_right_;
   int maximized_top_offset_;
   int theme_background_y_;
 
   DISALLOW_COPY_AND_ASSIGN(FrameBackground);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WINDOW_FRAME_BACKGROUND_H_