Begin tracking why layout is invalidated

Source/core/svg/SVGMarkerElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) Research In Motion Limited 2009-2010. 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 106 matching lines @@
 }
 
 void SVGMarkerElement::childrenChanged(const ChildrenChange& change)
 {
     SVGElement::childrenChanged(change);
 
     if (change.byParser)
         return;
 
     if (LayoutObject* object = layoutObject())
-        object->setNeedsLayoutAndFullPaintInvalidation();
+        object->setNeedsLayoutAndFullPaintInvalidation(LayoutInvalidationReason::ChildChanged);
 }
 
 void SVGMarkerElement::setOrientToAuto()
 {
     m_orientAngle->baseValue()->orientType()->setEnumValue(SVGMarkerOrientAuto);
     invalidateSVGAttributes();
     svgAttributeChanged(SVGNames::orientAttr);
 }
 
 void SVGMarkerElement::setOrientToAngle(PassRefPtrWillBeRawPtr<SVGAngleTearOff> angle)
@@ skipping 12 matching lines @@
 
 bool SVGMarkerElement::selfHasRelativeLengths() const
 {
     return m_refX->currentValue()->isRelative()
         || m_refY->currentValue()->isRelative()
         || m_markerWidth->currentValue()->isRelative()
         || m_markerHeight->currentValue()->isRelative();
 }
 
 } // namespace blink