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

ui/views/controls/menu/submenu_view.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_CONTROLS_MENU_SUBMENU_VIEW_H_
 #define UI_VIEWS_CONTROLS_MENU_SUBMENU_VIEW_H_
 #pragma once
 
 #include <string>
 
@@ skipping 42 matching lines @@
 
   // Positions and sizes the child views. This tiles the views vertically,
   // giving each child the available width.
   virtual void Layout() OVERRIDE;
   virtual gfx::Size GetPreferredSize() OVERRIDE;
 
   // Override from View.
   virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
 
   // Painting.
-  virtual void PaintChildren(gfx::Canvas* canvas) OVERRIDE;
+  virtual void PaintChildren(gfx::CanvasSkia* canvas) OVERRIDE;
 
   // Drag and drop methods. These are forwarded to the MenuController.
   virtual bool GetDropFormats(
       int* formats,
       std::set<OSExchangeData::CustomFormat>* custom_formats) OVERRIDE;
   virtual bool AreDropTypesRequired() OVERRIDE;
   virtual bool CanDrop(const OSExchangeData& data) OVERRIDE;
   virtual void OnDragEntered(const DropTargetEvent& event) OVERRIDE;
   virtual int OnDragUpdated(const DropTargetEvent& event) OVERRIDE;
   virtual void OnDragExited() OVERRIDE;
@@ skipping 83 matching lines @@
 
   // View method. Overridden to schedule a paint. We do this so that when
   // scrolling occurs, everything is repainted correctly.
   virtual void OnBoundsChanged(const gfx::Rect& previous_bounds) OVERRIDE;
 
   virtual void ChildPreferredSizeChanged(View* child) OVERRIDE;
 
  private:
   // Paints the drop indicator. This is only invoked if item is non-NULL and
   // position is not DROP_NONE.
-  void PaintDropIndicator(gfx::Canvas* canvas,
+  void PaintDropIndicator(gfx::CanvasSkia* canvas,
                           MenuItemView* item,
                           MenuDelegate::DropPosition position);
 
   void SchedulePaintForDropIndicator(MenuItemView* item,
                                      MenuDelegate::DropPosition position);
 
   // Calculates the location of th edrop indicator.
   gfx::Rect CalculateDropIndicatorBounds(MenuItemView* item,
                                          MenuDelegate::DropPosition position);
 
@@ skipping 28 matching lines @@
 
   // The submenu's scroll animator
   scoped_ptr<ScrollAnimator> scroll_animator_;
 
   DISALLOW_COPY_AND_ASSIGN(SubmenuView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_MENU_SUBMENU_VIEW_H_