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

ui/views/controls/native/native_view_host.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_CONTROLS_NATIVE_NATIVE_VIEW_HOST_H_
 #define UI_VIEWS_CONTROLS_NATIVE_NATIVE_VIEW_HOST_H_
 #pragma once
 
 #include <string>
 
 #include "ui/gfx/native_widget_types.h"
@@ skipping 59 matching lines @@
   }
 
   // Accessor for |native_view_|.
   gfx::NativeView native_view() const { return native_view_; }
 
   void NativeViewDestroyed();
 
   // Overridden from View:
   virtual gfx::Size GetPreferredSize() OVERRIDE;
   virtual void Layout() OVERRIDE;
-  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
+  virtual void OnPaint(gfx::CanvasSkia* canvas) OVERRIDE;
   virtual void VisibilityChanged(View* starting_from, bool is_visible) OVERRIDE;
   virtual void OnFocus() OVERRIDE;
   virtual gfx::NativeViewAccessible GetNativeViewAccessible() OVERRIDE;
 
  protected:
   virtual bool NeedsNotificationWhenVisibleBoundsChange() const OVERRIDE;
   virtual void OnVisibleBoundsChanged() OVERRIDE;
   virtual void ViewHierarchyChanged(bool is_add,
                                     View* parent,
                                     View* child) OVERRIDE;
@@ skipping 23 matching lines @@
 
   // The view that should be given focus when this NativeViewHost is focused.
   View* focus_view_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeViewHost);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_NATIVE_NATIVE_VIEW_HOST_H_