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

ui/views/widget/native_widget_win.h

 // 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_WIDGET_NATIVE_WIDGET_WIN_H_
 #define UI_VIEWS_WIDGET_NATIVE_WIDGET_WIN_H_
 #pragma once
 
 #include <atlbase.h>
 #include <atlapp.h>
@@ skipping 14 matching lines @@
 #include "ui/views/focus/focus_manager.h"
 #include "ui/views/layout/layout_manager.h"
 #include "ui/views/widget/native_widget_private.h"
 
 namespace ui {
 class Compositor;
 class ViewProp;
 }
 
 namespace gfx {
-class CanvasSkia;
+class Canvas;
 class Font;
 class Rect;
 }
 
 namespace views {
 
 class DropTargetWin;
 class RootView;
 class TooltipManagerWin;
 
@@ skipping 497 matching lines @@
   // most likely want to set this to false, or after changing the alpha toggle
   // the extended style bit to false than back to true. See MSDN for more
   // details.
   bool use_layered_buffer_;
 
   // The default alpha to be applied to the layered window.
   BYTE layered_alpha_;
 
   // A canvas that contains the window contents in the case of a layered
   // window.
-  scoped_ptr<gfx::CanvasSkia> layered_window_contents_;
+  scoped_ptr<gfx::Canvas> layered_window_contents_;
 
   // We must track the invalid rect ourselves, for two reasons:
   // For layered windows, Windows will not do this properly with
   // InvalidateRect()/GetUpdateRect(). (In fact, it'll return misleading
   // information from GetUpdateRect()).
   // We also need to keep track of the invalid rectangle for the RootView should
   // we need to paint the non-client area. The data supplied to WM_NCPAINT seems
   // to be insufficient.
   gfx::Rect invalid_rect_;
 
@@ skipping 84 matching lines @@
   bool has_non_client_view_;
 
   bool remove_standard_frame_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeWidgetWin);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_NATIVE_WIDGET_WIN_H_