Track reasons for |Node::SetNeedsStyleRecalc|

Source/core/svg/SVGAElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2010 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 74 matching lines @@
 {
     // Unlike other SVG*Element classes, SVGAElement only listens to SVGURIReference changes
     // as none of the other properties changes the linking behaviour for our <a> element.
     if (SVGURIReference::isKnownAttribute(attrName)) {
         SVGElement::InvalidationGuard invalidationGuard(this);
 
         bool wasLink = isLink();
         setIsLink(!hrefString().isNull());
 
         if (wasLink != isLink())
-            setNeedsStyleRecalc(SubtreeStyleChange);
+            setNeedsStyleRecalc(StyleRecalcDueToLinkColorChange, SubtreeStyleChange);
 
         return;
     }
 
     SVGGraphicsElement::svgAttributeChanged(attrName);
 }
 
 RenderObject* SVGAElement::createRenderer(RenderStyle*)
 {
     if (parentNode() && parentNode()->isSVGElement() && toSVGElement(parentNode())->isTextContent())
@@ skipping 99 matching lines @@
         return SVGElement::canStartSelection();
     return hasEditableStyle();
 }
 
 bool SVGAElement::willRespondToMouseClickEvents()
 {
     return isLink() || SVGGraphicsElement::willRespondToMouseClickEvents();
 }
 
 } // namespace blink