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

chrome/browser/ui/views/dropdown_bar_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 CHROME_BROWSER_UI_VIEWS_DROPDOWN_BAR_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_DROPDOWN_BAR_VIEW_H_
 #pragma once
 
 #include "chrome/browser/ui/views/dropdown_bar_host.h"
 #include "chrome/browser/ui/views/dropdown_bar_host_delegate.h"
 #include "ui/views/accessible_pane_view.h"
 
 namespace gfx {
-class Canvas;
-}  // namespace gfx
+class CanvasSkia;
+}
 
 ////////////////////////////////////////////////////////////////////////////////
 //
 // The DropdownBarView is an abstract view to draw the UI controls of the
 // DropdownBarHost.
 //
 ////////////////////////////////////////////////////////////////////////////////
 class DropdownBarView : public views::AccessiblePaneView,
                         public DropdownBarHostDelegate {
  public:
   explicit DropdownBarView(DropdownBarHost* host);
   virtual ~DropdownBarView();
 
   // Updates the view to let it know where the host is clipping the
   // dropdown widget (while animating the opening or closing of the widget).
   virtual void SetAnimationOffset(int offset) OVERRIDE;
 
   // Returns the offset used while animating.
   int animation_offset() const { return animation_offset_; }
 
  protected:
   // views::View:
-  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
+  virtual void OnPaint(gfx::CanvasSkia* canvas) OVERRIDE;
 
   // Returns the DropdownBarHost that manages this view.
   DropdownBarHost* host() const { return host_; }
 
   void SetBackground(const SkBitmap* left_alpha_mask,
                      const SkBitmap* right_alpha_mask);
   void SetBorder(int left_border_bitmap_id, int middle_border_bitmap_id,
                  int right_border_bitmap_id);
 
  private:
   // The dropdown bar host that controls this view.
   DropdownBarHost* host_;
 
   // While animating, the host clips the widget and draws only the bottom
   // part of it. The view needs to know the pixel offset at which we are drawing
   // the widget so that we can draw the curved edges that attach to the toolbar
   // in the right location.
   int animation_offset_;
 
   DISALLOW_COPY_AND_ASSIGN(DropdownBarView);
 };
 #endif  // CHROME_BROWSER_UI_VIEWS_DROPDOWN_BAR_VIEW_H_