Begin tracking why layout is invalidated

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
  * modify it under the terms of the GNU Library General Public
@@ skipping 4520 matching lines @@
     // FIXME: The table code should handle that automatically. If not,
     // we should fix it and remove the table part checks.
     if (box->isTable()) {
         // Because we may have added some sections with already computed column structures, we need to
         // sync the table structure with them now. This avoids crashes when adding new cells to the table.
         toLayoutTable(box)->forceSectionsRecalc();
     } else if (box->isTableSection()) {
         toLayoutTableSection(box)->setNeedsCellRecalc();
     }
 
-    box->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation();
+    box->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::AnonymousBlockChange);
 }
 
 LayoutObject* LayoutBox::splitAnonymousBoxesAroundChild(LayoutObject* beforeChild)
 {
     bool didSplitParentAnonymousBoxes = false;
 
     while (beforeChild->parent() != this) {
         LayoutBox* boxToSplit = toLayoutBox(beforeChild->parent());
         if (boxToSplit->slowFirstChild() != beforeChild && boxToSplit->isAnonymous()) {
             didSplitParentAnonymousBoxes = true;
@@ skipping 93 matching lines @@
     computedValues.m_margins.m_end = marginEnd();
 
     setLogicalTop(oldLogicalTop);
     setLogicalWidth(oldLogicalWidth);
     setLogicalLeft(oldLogicalLeft);
     setMarginLeft(oldMarginLeft);
     setMarginRight(oldMarginRight);
 }
 
 } // namespace blink