Paint backgrounds of a table section/row in one display item

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 471 matching lines @@
   // writing-mode:vertical-rl).
   virtual bool hasTopOverflow() const;
   virtual bool hasLeftOverflow() const;
 
   void addLayoutOverflow(const LayoutRect&);
   void addSelfVisualOverflow(const LayoutRect&);
   void addContentsVisualOverflow(const LayoutRect&);
 
   void addVisualEffectOverflow();
   LayoutRectOutsets computeVisualEffectOverflowOutsets();
-  void addOverflowFromChild(LayoutBox* child) {
+  void addOverflowFromChild(const LayoutBox* child) {

[wkorman, 2017/03/31 22:15:41]

If modifying signature and it won't be null perhaps just make it const&? Same
below.

[Xianzhu, 2017/03/31 23:26:30]

Done.

     addOverflowFromChild(child, child->locationOffset());
   }
-  void addOverflowFromChild(LayoutBox* child, const LayoutSize& delta);
+  void addOverflowFromChild(const LayoutBox* child, const LayoutSize& delta);

[Xianzhu, 2017/03/31 23:26:30]

Done.

   void clearLayoutOverflow();
   void clearAllOverflows() { m_overflow.reset(); }
 
   void updateLayerTransformAfterLayout();
 
   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
@@ skipping 1196 matching lines @@
          breakValue == EBreakBetween::kLeft ||
          breakValue == EBreakBetween::kPage ||
          breakValue == EBreakBetween::kRecto ||
          breakValue == EBreakBetween::kRight ||
          breakValue == EBreakBetween::kVerso;
 }
 
 }  // namespace blink
 
 #endif  // LayoutBox_h