Update PaintLayer size during layout, not after.

third_party/WebKit/Source/core/layout/LayoutPart.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Simon Hausmann <hausmann@kde.org>
  *           (C) 2000 Stefan Schimanski (1Stein@gmx.de)
  * Copyright (C) 2004, 2005, 2006, 2009 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 268 matching lines @@
   if (Style()->Visibility() != EVisibility::kVisible) {
     frame_or_plugin->Hide();
   } else {
     frame_or_plugin->Show();
   }
 }
 
 void LayoutPart::UpdateLayout() {
   DCHECK(NeedsLayout());
   LayoutAnalyzer::Scope analyzer(*this);
+  UpdateAfterLayout();
   ClearNeedsLayout();
 }
 
 void LayoutPart::Paint(const PaintInfo& paint_info,
                        const LayoutPoint& paint_offset) const {
   PartPainter(*this).Paint(paint_info, paint_offset);
 }
 
 void LayoutPart::PaintContents(const PaintInfo& paint_info,
                                const LayoutPoint& paint_offset) const {
@@ skipping 120 matching lines @@
   LayoutReplaced::InvalidatePaintOfSubtreesIfNeeded(paint_invalidation_state);
 }
 
 bool LayoutPart::IsThrottledFrameView() const {
   if (FrameView* frame_view = ChildFrameView())
     return frame_view->ShouldThrottleRendering();
   return false;
 }
 
 }  // namespace blink