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

ui/views/cocoa/bridged_native_widget.mm

 // 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.
 
 #import "ui/views/cocoa/bridged_native_widget.h"
 
 #import <objc/runtime.h>
 
 #include "base/logging.h"
 #include "base/mac/mac_util.h"
@@ skipping 576 matching lines @@
 void BridgedNativeWidget::OnDidChangeFocus(View* focused_before,
                                            View* focused_now) {
   ui::TextInputClient* input_client =
       focused_now ? focused_now->GetTextInputClient() : NULL;
   [bridged_view_ setTextInputClient:input_client];
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // BridgedNativeWidget, LayerDelegate:
 
-void BridgedNativeWidget::OnPaintLayer(gfx::Canvas* canvas) {
+void BridgedNativeWidget::OnPaintLayer(const ui::PaintContext& context) {
   DCHECK(window_visible_);
-  native_widget_mac_->GetWidget()->OnNativeWidgetPaint(canvas);
+  native_widget_mac_->GetWidget()->OnNativeWidgetPaint(context);
 }
 
 void BridgedNativeWidget::OnDelegatedFrameDamage(
     const gfx::Rect& damage_rect_in_dip) {
   NOTIMPLEMENTED();
 }
 
 void BridgedNativeWidget::OnDeviceScaleFactorChanged(
     float device_scale_factor) {
   NOTIMPLEMENTED();
@@ skipping 192 matching lines @@
       window_, &kWindowPropertiesKey);
   if (!properties) {
     properties = [NSMutableDictionary dictionary];
     objc_setAssociatedObject(window_, &kWindowPropertiesKey,
                              properties, OBJC_ASSOCIATION_RETAIN);
   }
   return properties;
 }
 
 }  // namespace views