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

ui/views/drag_utils.h

Index: ui/views/drag_utils.h
diff --git a/ui/views/drag_utils.h b/ui/views/drag_utils.h
index cdf9e2ca4404f665e34566affd1dd961b724ef4e..3abe910f14c0f4de11569a316e1cc193fd8421b1 100644
--- a/ui/views/drag_utils.h
+++ b/ui/views/drag_utils.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.
 
@@ -16,7 +16,7 @@ class GURL;
 class SkBitmap;
 
 namespace gfx {
-class Canvas;
+class CanvasSkia;
 class Point;
 class Size;
 }
@@ -46,7 +46,7 @@ VIEWS_EXPORT void CreateDragImageForFile(const FilePath& file_name,
 // Sets the drag image on data_object from the supplied canvas. width/height
 // are the size of the image to use, and the offsets give the location of
 // the hotspot for the drag image.
-VIEWS_EXPORT void SetDragImageOnDataObject(const gfx::Canvas& canvas,
+VIEWS_EXPORT void SetDragImageOnDataObject(const gfx::CanvasSkia& canvas,
                                            const gfx::Size& size,
                                            const gfx::Point& cursor_offset,
                                            ui::OSExchangeData* data_object);