Refactored invalidation set extraction.

third_party/WebKit/Source/core/css/CSSSelector.h

Index: third_party/WebKit/Source/core/css/CSSSelector.h
diff --git a/third_party/WebKit/Source/core/css/CSSSelector.h b/third_party/WebKit/Source/core/css/CSSSelector.h
index c7dd1b97ea55890b778acbe1676c2c68c1120d79..22378a0187aac4a27c6eb56da0cf2193529beeda 100644
--- a/third_party/WebKit/Source/core/css/CSSSelector.h
+++ b/third_party/WebKit/Source/core/css/CSSSelector.h
@@ -262,6 +262,7 @@ public:
     bool isHostPseudoClass() const { return m_pseudoType == PseudoHost || m_pseudoType == PseudoHostContext; }
     bool isUserActionPseudoClass() const;
     bool isInsertionPointCrossing() const { return m_pseudoType == PseudoHostContext || m_pseudoType == PseudoContent; }
+    bool isIdClassOrAttributeSelector() const;
 
     RelationType relation() const { return static_cast<RelationType>(m_relation); }
     void setRelation(RelationType relation)
@@ -492,6 +493,13 @@ inline bool CSSSelector::isUserActionPseudoClass() const
         || m_pseudoType == PseudoDrag;
 }
 
+inline bool CSSSelector::isIdClassOrAttributeSelector() const
+{
+    return isAttributeSelector()
+        || match() == CSSSelector::Id
+        || match() == CSSSelector::Class;
+}
+
 } // namespace blink
 
 #endif // CSSSelector_h