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

ui/views/window/frame_background.h

Index: ui/views/window/frame_background.h
diff --git a/ui/views/window/frame_background.h b/ui/views/window/frame_background.h
index 8df2a09ac03de5629937f757b6790aa471ec7bcf..05c5507c5c385b96a5af2be9a2dbd9bb86a0422d 100644
--- a/ui/views/window/frame_background.h
+++ b/ui/views/window/frame_background.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.
 
@@ -12,7 +12,7 @@
 
 class SkBitmap;
 namespace gfx {
-class Canvas;
+class CanvasSkia;
 }
 
 namespace views {
@@ -76,15 +76,15 @@ class VIEWS_EXPORT FrameBackground {
   // 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_;