Begin tracking why layout is invalidated

Source/core/layout/LayoutTableCell.cpp

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 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
@@ skipping 83 matching lines @@
     m_hasRowSpan = node() && parseRowSpanFromDOM() != 1;
 }
 
 void LayoutTableCell::colSpanOrRowSpanChanged()
 {
     ASSERT(node());
     ASSERT(isHTMLTableCellElement(*node()));
 
     updateColAndRowSpanFlags();
 
-    setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation();
+    setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::AttributeChanged);
     if (parent() && section())
         section()->setNeedsCellRecalc();
 }
 
 Length LayoutTableCell::logicalWidthFromColumns(LayoutTableCol* firstColForThisCell, Length widthFromStyle) const
 {
     ASSERT(firstColForThisCell && firstColForThisCell == table()->colElement(col()));
     LayoutTableCol* tableCol = firstColForThisCell;
 
     unsigned colSpanCount = colSpan();
@@ skipping 933 matching lines @@
 
 LayoutTableCell* LayoutTableCell::createAnonymousWithParentRenderer(const LayoutObject* parent)
 {
     LayoutTableCell* newCell = LayoutTableCell::createAnonymous(&parent->document());
     RefPtr<LayoutStyle> newStyle = LayoutStyle::createAnonymousStyleWithDisplay(parent->styleRef(), TABLE_CELL);
     newCell->setStyle(newStyle.release());
     return newCell;
 }
 
 } // namespace blink