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

chrome/browser/chromeos/display/overscan_calibrator.h

Index: chrome/browser/chromeos/display/overscan_calibrator.h
diff --git a/chrome/browser/chromeos/display/overscan_calibrator.h b/chrome/browser/chromeos/display/overscan_calibrator.h
index 3411e01133be32a3b3103439f1dfa9e54c8ea739..6395f6fbb29b89bdf7fe5d257501c48a787c7f38 100644
--- a/chrome/browser/chromeos/display/overscan_calibrator.h
+++ b/chrome/browser/chromeos/display/overscan_calibrator.h
@@ -41,7 +41,7 @@ class OverscanCalibrator : public ui::LayerDelegate {
 
  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;