Add a first pass of a class descendant invalidator, and a containing RuleSetAnalyzer

Source/core/dom/shadow/SelectRuleFeatureSet.h

Index: Source/core/dom/shadow/SelectRuleFeatureSet.h
diff --git a/Source/core/dom/shadow/SelectRuleFeatureSet.h b/Source/core/dom/shadow/SelectRuleFeatureSet.h
index 429d2777699c1c3b5d92eeebadd456f3dc911a89..ed11757958a02ae3b6ffb408f4fd07421a9fb180 100644
--- a/Source/core/dom/shadow/SelectRuleFeatureSet.h
+++ b/Source/core/dom/shadow/SelectRuleFeatureSet.h
@@ -48,6 +48,8 @@ public:
     bool hasSelectorForClass(const AtomicString&) const;
     bool hasSelectorForAttribute(const AtomicString&) const;
 
+    const RuleSetAnalyzer* ruleSetAnalyzer() const;
+
     bool hasSelectorForChecked() const { return hasSelectorFor(AffectedSelectorChecked); }
     bool hasSelectorForEnabled() const { return hasSelectorFor(AffectedSelectorEnabled); }
     bool hasSelectorForDisabled() const { return hasSelectorFor(AffectedSelectorDisabled); }
@@ -65,6 +67,12 @@ private:
     int m_featureFlags;
 };
 
+// FIXME: make the shadow DOM smarter about analyzing select rules.
+inline const RuleSetAnalyzer* SelectRuleFeatureSet::ruleSetAnalyzer() const
+{
+    return 0;
+}
+
 inline bool SelectRuleFeatureSet::hasSelectorForId(const AtomicString& idValue) const
 {
     ASSERT(!idValue.isEmpty());