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

content/browser/web_contents/aura/gesture_nav_simple.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 "content/browser/web_contents/aura/gesture_nav_simple.h"
 
 #include "cc/layers/layer.h"
 #include "content/browser/frame_host/navigation_controller_impl.h"
 #include "content/browser/renderer_host/overscroll_controller.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/browser/web_contents/web_contents_view.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/overscroll_configuration.h"
 #include "content/public/common/content_client.h"
 #include "ui/aura/window.h"
 #include "ui/compositor/layer.h"
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/compositor/layer_delegate.h"
+#include "ui/compositor/paint_context.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/gfx/animation/tween.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/image/image.h"
 #include "ui/resources/grit/ui_resources.h"
 
 namespace content {
 
 namespace {
 
@@ skipping 48 matching lines @@
         left_arrow_(resource_id == IDR_BACK_ARROW) {
     CHECK(!image_.IsEmpty());
   }
 
   ~ArrowLayerDelegate() override {}
 
   bool left() const { return left_arrow_; }
 
  private:
   // ui::LayerDelegate:
-  void OnPaintLayer(gfx::Canvas* canvas) override {
+  void OnPaintLayer(const ui::PaintContext& context) override {
     SkPaint paint;
     paint.setColor(SkColorSetARGB(0xa0, 0, 0, 0));
     paint.setStyle(SkPaint::kFill_Style);
     paint.setAntiAlias(true);
 
+    gfx::Canvas* canvas = context.canvas();
     canvas->DrawCircle(
         gfx::Point(left_arrow_ ? 0 : kArrowWidth, kArrowHeight / 2),
         kArrowWidth,
         paint);
     canvas->DrawImageInt(*image_.ToImageSkia(),
                          left_arrow_ ? 0 : kArrowWidth - image_.Width(),
                          (kArrowHeight - image_.Height()) / 2);
   }
 
   void OnDelegatedFrameDamage(const gfx::Rect& damage_rect_in_dip) override {}
@@ skipping 123 matching lines @@
   clip_layer_->SetBounds(window->layer()->bounds());
   clip_layer_->SetMasksToBounds(true);
   clip_layer_->Add(arrow_.get());
 
   ui::Layer* parent = window->layer()->parent();
   parent->Add(clip_layer_.get());
   parent->StackAtTop(clip_layer_.get());
 }
 
 }  // namespace content