Make View::Paint use ui::PaintRecorder to access PaintContext's canvas

ui/views/widget/desktop_aura/desktop_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/desktop_aura/desktop_native_widget_aura.h"
 
 #include "base/bind.h"
 #include "base/trace_event/trace_event.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/client/cursor_client.h"
@@ skipping 993 matching lines @@
 }
 
 bool DesktopNativeWidgetAura::CanFocus() {
   return true;
 }
 
 void DesktopNativeWidgetAura::OnCaptureLost() {
   native_widget_delegate_->OnMouseCaptureLost();
 }
 
-void DesktopNativeWidgetAura::OnPaint(gfx::Canvas* canvas) {
-  native_widget_delegate_->OnNativeWidgetPaint(canvas);
+void DesktopNativeWidgetAura::OnPaint(const ui::PaintContext& context) {
+  native_widget_delegate_->OnNativeWidgetPaint(context);
 }
 
 void DesktopNativeWidgetAura::OnDeviceScaleFactorChanged(
     float device_scale_factor) {
 }
 
 void DesktopNativeWidgetAura::OnWindowDestroying(aura::Window* window) {
   // Cleanup happens in OnHostClosed().
 }
 
@@ skipping 213 matching lines @@
   if (cursor_reference_count_ == 0) {
     // We are the last DesktopNativeWidgetAura instance, and we are responsible
     // for cleaning up |cursor_manager_|.
     delete cursor_manager_;
     native_cursor_manager_ = NULL;
     cursor_manager_ = NULL;
   }
 }
 
 }  // namespace views