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

chrome/browser/ntp_background_util.h

Index: chrome/browser/ntp_background_util.h
diff --git a/chrome/browser/ntp_background_util.h b/chrome/browser/ntp_background_util.h
index a9558ec47ce08287c698a09cddc4c148fbe0ca4a..04d8d512f2afee791d459e66da163eccef7c0f89 100644
--- a/chrome/browser/ntp_background_util.h
+++ b/chrome/browser/ntp_background_util.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2009 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.
 
@@ -7,7 +7,7 @@
 #pragma once
 
 namespace gfx {
-class Canvas;
+class CanvasSkia;
 class Rect;
 }
 
@@ -21,9 +21,10 @@ class NtpBackgroundUtil {
   // that gets painted and also serves as the origin of the image (for top-
   // aligned images). |tab_contents_height| is necessary for correctly painting
   // bottom-aligned images since then the origin is the bottom of the web page.
-  static void PaintBackgroundDetachedMode(
-      ui::ThemeProvider* tp, gfx::Canvas* canvas,
-      const gfx::Rect& area, int tab_contents_height);
+  static void PaintBackgroundDetachedMode(ui::ThemeProvider* tp,
+                                          gfx::CanvasSkia* canvas,
+                                          const gfx::Rect& area,
+                                          int tab_contents_height);
 
  private:
   NtpBackgroundUtil() {}