Make View::Paint use ui::PaintRecorder to access PaintContext's canvas

ui/aura_extra/image_window_delegate.h

 // Copyright (c) 2013 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_AURA_EXTRA_IMAGE_WINDOW_DELEGATE_H_
 #define UI_AURA_EXTRA_IMAGE_WINDOW_DELEGATE_H_
 
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/aura_extra/aura_extra_export.h"
@@ skipping 30 matching lines @@
   void OnBoundsChanged(const gfx::Rect& old_bounds,
                        const gfx::Rect& new_bounds) override;
   ui::TextInputClient* GetFocusedTextInputClient() override;
   gfx::NativeCursor GetCursor(const gfx::Point& point) override;
   int GetNonClientComponent(const gfx::Point& point) const override;
   bool ShouldDescendIntoChildForEventHandling(
       aura::Window* child,
       const gfx::Point& location) override;
   bool CanFocus() override;
   void OnCaptureLost() override;
-  void OnPaint(gfx::Canvas* canvas) override;
+  void OnPaint(const ui::PaintContext& context) override;
   void OnDeviceScaleFactorChanged(float device_scale_factor) override;
   void OnWindowDestroying(aura::Window* window) override;
   void OnWindowDestroyed(aura::Window* window) override;
   void OnWindowTargetVisibilityChanged(bool visible) override;
   bool HasHitTestMask() const override;
   void GetHitTestMask(gfx::Path* mask) const override;
 
  protected:
   SkColor background_color_;
   gfx::Image image_;
   gfx::Vector2d offset_;
 
   gfx::Size window_size_;
 
   // Keeps track of whether the window size matches the image size or not. If
   // the image size is smaller than the window size, then the delegate fills the
   // missing regions with |background_color_| (defult is white).
   bool size_mismatch_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageWindowDelegate);
 };
 
 }  // namespace aura_extra
 
 #endif  // UI_AURA_EXTRA_IMAGE_WINDOW_DELEGATE_H_