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

ui/views/widget/widget.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/widget.h"
 
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 1162 matching lines @@
 
 bool Widget::OnNativeWidgetPaintAccelerated(const gfx::Rect& dirty_region) {
   ui::Compositor* compositor = GetCompositor();
   if (!compositor)
     return false;
 
   compositor->ScheduleRedrawRect(dirty_region);
   return true;
 }
 
-void Widget::OnNativeWidgetPaint(gfx::Canvas* canvas) {
+void Widget::OnNativeWidgetPaint(const ui::PaintContext& context) {
   // On Linux Aura, we can get here during Init() because of the
   // SetInitialBounds call.
   if (!native_widget_initialized_)
     return;
-  GetRootView()->Paint(ui::PaintContext(canvas, GetLayer()->PaintRect()));
+  GetRootView()->Paint(context);
 }
 
 int Widget::GetNonClientComponent(const gfx::Point& point) {
   int component = non_client_view_ ?
       non_client_view_->NonClientHitTest(point) :
       HTNOWHERE;
 
   if (movement_disabled_ && (component == HTCAPTION || component == HTSYSMENU))
     return HTNOWHERE;
 
@@ skipping 339 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // internal::NativeWidgetPrivate, NativeWidget implementation:
 
 internal::NativeWidgetPrivate* NativeWidgetPrivate::AsNativeWidgetPrivate() {
   return this;
 }
 
 }  // namespace internal
 }  // namespace views