Pass a ui::PaintContext from ui::Layer to layer delegates.

ui/wm/core/image_grid.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_WM_CORE_IMAGE_GRID_H_
 #define UI_WM_CORE_IMAGE_GRID_H_
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 119 matching lines @@
   class ImagePainter : public ui::LayerDelegate {
    public:
     ImagePainter(const gfx::ImageSkia& image) : image_(image) {}
     ~ImagePainter() override {}
 
     // Clips |layer| to |clip_rect|.  Triggers a repaint if the clipping
     // rectangle has changed.  An empty rectangle disables clipping.
     void SetClipRect(const gfx::Rect& clip_rect, ui::Layer* layer);
 
     // ui::LayerDelegate implementation:
-    void OnPaintLayer(gfx::Canvas* canvas) override;
+    void OnPaintLayer(const ui::PaintContext& context) override;
     void OnDelegatedFrameDamage(const gfx::Rect& damage_rect_in_dip) override;
     void OnDeviceScaleFactorChanged(float device_scale_factor) override;
     base::Closure PrepareForLayerBoundsChange() override;
 
    private:
     friend class TestAPI;
 
     const gfx::ImageSkia image_;
 
     gfx::Rect clip_rect_;
@@ skipping 62 matching lines @@
   scoped_ptr<ImagePainter> bottom_left_painter_;
   scoped_ptr<ImagePainter> bottom_painter_;
   scoped_ptr<ImagePainter> bottom_right_painter_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageGrid);
 };
 
 }  // namespace wm
 
 #endif  // UI_WM_CORE_IMAGE_GRID_H_