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

chrome/browser/ui/views/notifications/balloon_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.
 
 // Draws the view for the balloons.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_NOTIFICATIONS_BALLOON_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_NOTIFICATIONS_BALLOON_VIEW_H_
 #pragma once
 
@@ skipping 44 matching lines @@
   virtual void Update() OVERRIDE;
   virtual void RepositionToBalloon() OVERRIDE;
   virtual void Close(bool by_user) OVERRIDE;
   virtual gfx::Size GetSize() const OVERRIDE;
   virtual BalloonHost* GetHost() const OVERRIDE;
 
   void set_enable_web_ui(bool enable) { enable_web_ui_ = enable; }
 
  private:
   // views::View interface.
-  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
+  virtual void OnPaint(gfx::CanvasSkia* canvas) OVERRIDE;
   virtual void OnBoundsChanged(const gfx::Rect& previous_bounds) OVERRIDE;
   virtual gfx::Size GetPreferredSize() OVERRIDE;
 
   // views::ViewMenuDelegate interface.
   virtual void RunMenu(views::View* source, const gfx::Point& pt) OVERRIDE;
 
   // views::WidgetDelegate interface.
   virtual void OnDisplayChanged() OVERRIDE;
   virtual void OnWorkAreaChanged() OVERRIDE;
 
@@ skipping 83 matching lines @@
 
   content::NotificationRegistrar notification_registrar_;
 
   // Set to true if this is browser generate web UI.
   bool enable_web_ui_;
 
   DISALLOW_COPY_AND_ASSIGN(BalloonViewImpl);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_NOTIFICATIONS_BALLOON_VIEW_H_