Support tag names as invalidation set features.

Source/core/css/RuleFeature.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 91 matching lines @@
     }
 }
 
 // This method is somewhat conservative in what it accepts.
 RuleFeatureSet::InvalidationSetMode RuleFeatureSet::invalidationSetModeForSelector(const CSSSelector& selector)
 {
     bool foundDescendantRelation = false;
     bool foundIdent = false;
     for (const CSSSelector* component = &selector; component; component = component->tagHistory()) {
 
-        // FIXME: next up: Tag.
-        if (component->m_match == CSSSelector::Class || component->m_match == CSSSelector::Id || component->isAttributeSelector() || component->isCustomPseudoElement()) {
+        if (component->m_match == CSSSelector::Class || component->m_match == CSSSelector::Id
+            || (component->m_match == CSSSelector::Tag && component->tagQName().localName() != starAtom)
+            || component->isAttributeSelector() || component->isCustomPseudoElement()) {
             if (!foundDescendantRelation)
                 foundIdent = true;
         } else if (component->pseudoType() == CSSSelector::PseudoHost || component->pseudoType() == CSSSelector::PseudoAny) {
             if (const CSSSelectorList* selectorList = component->selectorList()) {
                 for (const CSSSelector* selector = selectorList->first(); selector; selector = CSSSelectorList::next(*selector)) {
                     InvalidationSetMode hostMode = invalidationSetModeForSelector(*selector);
                     if (hostMode == UseSubtreeStyleChange)
                         return foundDescendantRelation ? UseLocalStyleChange : UseSubtreeStyleChange;
                     if (!foundDescendantRelation && hostMode == AddFeatures)
                         foundIdent = true;
@@ skipping 302 matching lines @@
     if (RefPtr<DescendantInvalidationSet> invalidationSet = m_classInvalidationSets.get(className))
         m_styleInvalidator.scheduleInvalidation(invalidationSet, element);
 }
 
 StyleInvalidator& RuleFeatureSet::styleInvalidator()
 {
     return m_styleInvalidator;
 }
 
 } // namespace WebCore