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

chrome/browser/chromeos/display/overscan_calibrator.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_CHROMEOS_DISPLAY_OVERSCAN_CALIBRATOR_H_
 #define CHROME_BROWSER_CHROMEOS_DISPLAY_OVERSCAN_CALIBRATOR_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/compositor/layer_delegate.h"
@@ skipping 23 matching lines @@
   // value. Otherwise, the default value is the old |initial_insets_|.
   void Reset();
 
   // Updates the insets and redraw the visual feedback.
   void UpdateInsets(const gfx::Insets& insets);
 
   const gfx::Insets& insets() const { return insets_; }
 
  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 target display.
   const gfx::Display display_;
 
   // The current insets.
   gfx::Insets insets_;
 
   // The insets initially given. Stored so we can undo the insets later.
   gfx::Insets initial_insets_;
 
   // Whether the current insets are committed to the system or not.
   bool committed_;
 
   // The visualization layer for the current calibration region.
   scoped_ptr<ui::Layer> calibration_layer_;
 
   DISALLOW_COPY_AND_ASSIGN(OverscanCalibrator);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_DISPLAY_OVERSCAN_CALIBRATOR_H_