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

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc.
  *               All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 4892 matching lines @@
     top = std::max(top, -rect.y() + outlineOutset);
     right = std::max(right, rect.maxX() - size().width() + outlineOutset);
     bottom = std::max(bottom, rect.maxY() - size().height() + outlineOutset);
     left = std::max(left, -rect.x() + outlineOutset);
   }
 
   return LayoutRectOutsets(top, right, bottom, left);
 }
 
 DISABLE_CFI_PERF
-void LayoutBox::addOverflowFromChild(LayoutBox* child,
+void LayoutBox::addOverflowFromChild(const LayoutBox* child,
                                      const LayoutSize& delta) {
   // Never allow flow threads to propagate overflow up to a parent.
   if (child->isLayoutFlowThread())
     return;
 
   // Only propagate layout overflow from the child if the child isn't clipping
   // its overflow.  If it is, then its overflow is internal to it, and we don't
   // care about it. layoutOverflowRectForPropagation takes care of this and just
   // propagates the border box rect instead.
   LayoutRect childLayoutOverflowRect =
@@ skipping 829 matching lines @@
 
 void LayoutBox::MutableForPainting::
     savePreviousContentBoxSizeAndLayoutOverflowRect() {
   auto& rareData = layoutBox().ensureRareData();
   rareData.m_hasPreviousContentBoxSizeAndLayoutOverflowRect = true;
   rareData.m_previousContentBoxSize = layoutBox().contentBoxRect().size();
   rareData.m_previousLayoutOverflowRect = layoutBox().layoutOverflowRect();
 }
 
 }  // namespace blink