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

chrome/browser/chromeos/ui/focus_ring_layer.h

 // Copyright 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 CHROME_BROWSER_CHROMEOS_UI_FOCUS_RING_LAYER_H_
 #define CHROME_BROWSER_CHROMEOS_UI_FOCUS_RING_LAYER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/compositor/layer_delegate.h"
@@ skipping 32 matching lines @@
   aura::Window* root_window() { return root_window_; }
 
  protected:
   // Updates |root_window_| and creates |layer_| if it doesn't exist,
   // or if the root window has changed. Moves the layer to the top if
   // it wasn't there already.
   void CreateOrUpdateLayer(aura::Window* root_window, const char* layer_name);
 
  private:
   // ui::LayerDelegate overrides:
-  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;
 
   // The object that owns this layer.
   FocusRingLayerDelegate* delegate_;
 
   // The current root window containing the focused object.
   aura::Window* root_window_;
 
   // The current layer.
   scoped_ptr<ui::Layer> layer_;
 
   // The bounding rectangle of the focused object, in |root_window_|
   // coordinates.
   gfx::Rect focus_ring_;
 
   DISALLOW_COPY_AND_ASSIGN(FocusRingLayer);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_UI_FOCUS_RING_LAYER_H_