Begin tracking why layout is invalidated

Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1587 matching lines @@
         if (!newPseudoStyle)
             return true;
         if (*newPseudoStyle != *pseudoStyleCache->at(i)) {
             if (pseudoId < FIRST_INTERNAL_PSEUDOID)
                 newStyle->setHasPseudoStyle(pseudoId);
             newStyle->addCachedPseudoStyle(newPseudoStyle);
             if (pseudoId == FIRST_LINE || pseudoId == FIRST_LINE_INHERITED) {
                 // FIXME: We should do an actual diff to determine whether a repaint vs. layout
                 // is needed, but for now just assume a layout will be required. The diff code
                 // in LayoutObject::setStyle would need to be factored out so that it could be reused.
-                layoutObject()->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation();
+                layoutObject()->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::StyleChange);
             }
             return true;
         }
     }
     return false;
 }
 
 PassRefPtr<ComputedStyle> Element::styleForLayoutObject()
 {
     ASSERT(document().inStyleRecalc());
@@ skipping 1876 matching lines @@
 {
 #if ENABLE(OILPAN)
     if (hasRareData())
         visitor->trace(elementRareData());
     visitor->trace(m_elementData);
 #endif
     ContainerNode::trace(visitor);
 }
 
 } // namespace blink