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

ui/views/widget/native_widget_aura.cc

 // Copyright (c) 2012 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 "ui/views/widget/native_widget_aura.h"
 
 #include "base/bind.h"
 #include "base/strings/string_util.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "ui/aura/client/aura_constants.h"
@@ skipping 808 matching lines @@
 }
 
 bool NativeWidgetAura::CanFocus() {
   return ShouldActivate();
 }
 
 void NativeWidgetAura::OnCaptureLost() {
   delegate_->OnMouseCaptureLost();
 }
 
-void NativeWidgetAura::OnPaint(gfx::Canvas* canvas) {
-  delegate_->OnNativeWidgetPaint(canvas);
+void NativeWidgetAura::OnPaint(const ui::PaintContext& context) {
+  delegate_->OnNativeWidgetPaint(context);
 }
 
 void NativeWidgetAura::OnDeviceScaleFactorChanged(float device_scale_factor) {
   GetWidget()->DeviceScaleFactorChanged(device_scale_factor);
 }
 
 void NativeWidgetAura::OnWindowDestroying(aura::Window* window) {
   window_->RemoveObserver(this);
   delegate_->OnNativeWidgetDestroying();
 
@@ skipping 364 matching lines @@
   l10n_util::AdjustUIFont(&(ncm.lfCaptionFont));
   base::win::ScopedHFONT caption_font(CreateFontIndirect(&(ncm.lfCaptionFont)));
   return gfx::FontList(gfx::Font(caption_font));
 #else
   return gfx::FontList();
 #endif
 }
 
 }  // namespace internal
 }  // namespace views