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

chrome/browser/chromeos/ui/focus_ring_layer.cc

 // 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.
 
 #include "chrome/browser/chromeos/ui/focus_ring_layer.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 {
 
 const int kShadowRadius = 10;
 const int kShadowAlpha = 90;
 const SkColor kShadowColor = SkColorSetRGB(77, 144, 254);
 
@@ skipping 29 matching lines @@
     layer_->set_delegate(this);
     layer_->SetFillsBoundsOpaquely(false);
     root_layer->Add(layer_.get());
   }
 
   // Keep moving it to the top in case new layers have been added
   // since we created this layer.
   layer_->parent()->StackAtTop(layer_.get());
 }
 
-void FocusRingLayer::OnPaintLayer(gfx::Canvas* canvas) {
+void FocusRingLayer::OnPaintLayer(const ui::PaintContext& context) {
   if (!root_window_ || focus_ring_.IsEmpty())
     return;
 
+  gfx::Canvas* canvas = context.canvas();
   gfx::Rect bounds = focus_ring_ - layer_->bounds().OffsetFromOrigin();
   SkPaint paint;
   paint.setColor(kShadowColor);
   paint.setFlags(SkPaint::kAntiAlias_Flag);
   paint.setStyle(SkPaint::kStroke_Style);
   paint.setStrokeWidth(2);
   int r = kShadowRadius;
   for (int i = 0; i < r; i++) {
     // Fade out alpha quadratically.
     paint.setAlpha((kShadowAlpha * (r - i) * (r - i)) / (r * r));
@@ skipping 10 matching lines @@
 void FocusRingLayer::OnDeviceScaleFactorChanged(float device_scale_factor) {
   if (delegate_)
     delegate_->OnDeviceScaleFactorChanged();
 }
 
 base::Closure FocusRingLayer::PrepareForLayerBoundsChange() {
   return base::Bind(&base::DoNothing);
 }
 
 }  // namespace chromeos