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

chrome/browser/ui/views/tabs/tab_strip.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_TABS_TAB_STRIP_H_
 #define CHROME_BROWSER_UI_VIEWS_TABS_TAB_STRIP_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 159 matching lines @@
   // AbstractTabStripView implementation:
   virtual bool IsTabStripEditable() const OVERRIDE;
   virtual bool IsTabStripCloseable() const OVERRIDE;
   virtual void UpdateLoadingAnimations() OVERRIDE;
   virtual bool IsPositionInWindowCaption(const gfx::Point& point) OVERRIDE;
   virtual void SetBackgroundOffset(const gfx::Point& offset) OVERRIDE;
   virtual views::View* GetNewTabButton() OVERRIDE;
 
   // views::View overrides:
   virtual void Layout() OVERRIDE;
-  virtual void PaintChildren(gfx::Canvas* canvas) OVERRIDE;
+  virtual void PaintChildren(gfx::CanvasSkia* canvas) OVERRIDE;
   virtual gfx::Size GetPreferredSize() OVERRIDE;
   // NOTE: the drag and drop methods are invoked from FrameView. This is done
   // to allow for a drop region that extends outside the bounds of the TabStrip.
   virtual void OnDragEntered(const views::DropTargetEvent& event) OVERRIDE;
   virtual int OnDragUpdated(const views::DropTargetEvent& event) OVERRIDE;
   virtual void OnDragExited() OVERRIDE;
   virtual int OnPerformDrop(const views::DropTargetEvent& event) OVERRIDE;
   virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
   virtual views::View* GetEventHandlerForPoint(
       const gfx::Point& point) OVERRIDE;
@@ skipping 308 matching lines @@
   // Size we last layed out at.
   gfx::Size last_layout_size_;
 
   // Are we in stacking/scrolling mode?
   bool stacking_;
 
   DISALLOW_COPY_AND_ASSIGN(TabStrip);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TABS_TAB_STRIP_H_