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

chrome/browser/chromeos/ui/accessibility_focus_ring_layer.cc

 // Copyright 2014 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.
 
 #include "chrome/browser/chromeos/ui/accessibility_focus_ring_layer.h"
 
 #include "ash/display/display_controller.h"
 #include "ash/shell.h"
 #include "base/bind.h"
 #include "ui/aura/window.h"
 #include "ui/compositor/layer.h"
+#include "ui/compositor/paint_context.h"
 #include "ui/gfx/canvas.h"
 
 namespace chromeos {
 
 namespace {
 
 // The number of pixels in the color gradient that fades to transparent.
 const int kGradientWidth = 6;
 
 // The color of the focus ring. In the future this might be a parameter.
@@ skipping 80 matching lines @@
   gfx::Display display =
       gfx::Screen::GetNativeScreen()->GetDisplayMatching(bounds);
   aura::Window* root_window = ash::Shell::GetInstance()->display_controller()
       ->GetRootWindowForDisplayId(display.id());
   CreateOrUpdateLayer(root_window, "AccessibilityFocusRing");
 
   // Update the layer bounds.
   layer()->SetBounds(bounds);
 }
 
-void AccessibilityFocusRingLayer::OnPaintLayer(gfx::Canvas* canvas) {
+void AccessibilityFocusRingLayer::OnPaintLayer(
+    const ui::PaintContext& context) {
   gfx::Vector2d offset = layer()->bounds().OffsetFromOrigin();
 
   SkPaint paint;
   paint.setFlags(SkPaint::kAntiAlias_Flag);
   paint.setStyle(SkPaint::kStroke_Style);
   paint.setStrokeWidth(2);
 
+  gfx::Canvas* canvas = context.canvas();
+
   SkPath path;
   const int w = kGradientWidth;
   for (int i = 0; i < w; ++i) {
     paint.setColor(
         SkColorSetARGBMacro(
             255 * (w - i) * (w - i) / (w * w),
             kFocusRingColorRed, kFocusRingColorGreen, kFocusRingColorBlue));
     path = MakePath(ring_, i, offset);
     canvas->DrawPath(path, paint);
   }
 }
 
 }  // namespace chromeos