Track reasons for |Node::SetNeedsStyleRecalc|

Source/core/html/HTMLAnchorElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Simon Hausmann <hausmann@kde.org>
  * Copyright (C) 2003, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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
@@ skipping 178 matching lines @@
 
 void HTMLAnchorElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
 {
     if (name == hrefAttr) {
         bool wasLink = isLink();
         setIsLink(!value.isNull());
         if (wasLink || isLink()) {
             AffectedSelectorMask affectedPseudo = AffectedSelectorLink | AffectedSelectorVisited;
             if (wasLink != isLink())
                 affectedPseudo |= AffectedSelectorEnabled;
-            didAffectSelector(affectedPseudo);
+            didAffectSelector(StyleChangeReasonForTracing::createWithExtraData(StyleChangeReason::PseudoClass, StyleChangeExtraData::LinkVisitedEnabled), affectedPseudo);
         }
         if (wasLink && !isLink() && treeScope().adjustedFocusedElement() == this) {
             // We might want to call blur(), but it's dangerous to dispatch
             // events here.
             document().setNeedsFocusedElementCheck();
         }
         if (isLink()) {
             String parsedURL = stripLeadingAndTrailingHTMLSpaces(value);
             if (document().isDNSPrefetchEnabled()) {
                 if (protocolIs(parsedURL, "http") || protocolIs(parsedURL, "https") || parsedURL.startsWith("//"))
@@ skipping 183 matching lines @@
             Vector<String> argv;
             argv.append("a");
             argv.append(fastGetAttribute(hrefAttr));
             activityLogger->logEvent("blinkAddElement", argv.size(), argv.data());
         }
     }
     return HTMLElement::insertedInto(insertionPoint);
 }
 
 }