Update PaintLayer size during layout, not after.

third_party/WebKit/Source/core/layout/LayoutBox.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2006, 2007 Apple Inc. 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
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 479 matching lines @@
 
   void AddVisualEffectOverflow();
   LayoutRectOutsets ComputeVisualEffectOverflowOutsets();
   void AddOverflowFromChild(const LayoutBox& child) {
     AddOverflowFromChild(child, child.LocationOffset());
   }
   void AddOverflowFromChild(const LayoutBox& child, const LayoutSize& delta);
   void ClearLayoutOverflow();
   void ClearAllOverflows() { overflow_.reset(); }
 
-  void UpdateLayerTransformAfterLayout();
+  virtual void UpdateAfterLayout();
 
   DISABLE_CFI_PERF LayoutUnit ContentWidth() const {
     // We're dealing with LayoutUnit and saturated arithmetic here, so we need
     // to guard against negative results. The value returned from clientWidth()
     // may in itself be a victim of saturated arithmetic; e.g. if both border
     // sides were sufficiently wide (close to LayoutUnit::max()).  Here we
     // subtract two padding values from that result, which is another source of
     // saturated arithmetic.
     return (ClientWidth() - PaddingLeft() - PaddingRight())
         .ClampNegativeToZero();
@@ skipping 1227 matching lines @@
          break_value == EBreakBetween::kLeft ||
          break_value == EBreakBetween::kPage ||
          break_value == EBreakBetween::kRecto ||
          break_value == EBreakBetween::kRight ||
          break_value == EBreakBetween::kVerso;
 }
 
 }  // namespace blink
 
 #endif  // LayoutBox_h