Compute the linkMatchType inside the CSSSelectorParser.

Source/core/css/CSSSelector.h

Index: Source/core/css/CSSSelector.h
diff --git a/Source/core/css/CSSSelector.h b/Source/core/css/CSSSelector.h
index a787c3647b947457c07250392cb6e75cb352368e..6932ca13fc11b0ba5c18eb91c82e4bc7d409012d 100644
--- a/Source/core/css/CSSSelector.h
+++ b/Source/core/css/CSSSelector.h
@@ -296,8 +296,11 @@ namespace blink {
         // http://dev.w3.org/csswg/selectors4/#compound
         bool isCompound() const;
 
+        // Note: the link match type is only valid for the start of each selector
+        // in a CSSSelectorList.
         enum LinkMatchMask { MatchLink = 1, MatchVisited = 2, MatchAll = MatchLink | MatchVisited };
-        unsigned computeLinkMatchType() const;
+        void updateLinkMatchType();
+        unsigned linkMatchType() const { return m_linkMatchType; }
 
         bool isForPage() const { return m_isForPage; }
         void setForPage() { m_isForPage = true; }
@@ -306,15 +309,16 @@ namespace blink {
         void setRelationIsAffectedByPseudoContent() { m_relationIsAffectedByPseudoContent = true; }
 
     private:
-        unsigned m_relation           : 3; // enum Relation
-        mutable unsigned m_match      : 4; // enum Match
-        mutable unsigned m_pseudoType : 8; // PseudoType
+        unsigned m_relation               : 3; // enum Relation
+        unsigned m_match                  : 4; // enum Match
+        unsigned m_pseudoType             : 8; // PseudoType
         unsigned m_isLastInSelectorList   : 1;
         unsigned m_isLastInTagHistory     : 1;
         unsigned m_hasRareData            : 1;
         unsigned m_isForPage              : 1;
         unsigned m_tagIsImplicit          : 1;
         unsigned m_relationIsAffectedByPseudoContent  : 1;
+        unsigned m_linkMatchType          : 2; // LinkMatchMask
 
         void setPseudoType(PseudoType pseudoType)
         {
@@ -417,6 +421,7 @@ inline CSSSelector::CSSSelector()
     , m_isForPage(false)
     , m_tagIsImplicit(false)
     , m_relationIsAffectedByPseudoContent(false)
+    , m_linkMatchType(MatchAll)
 {
 }
 
@@ -430,6 +435,7 @@ inline CSSSelector::CSSSelector(const QualifiedName& tagQName, bool tagIsImplici
     , m_isForPage(false)
     , m_tagIsImplicit(tagIsImplicit)
     , m_relationIsAffectedByPseudoContent(false)
+    , m_linkMatchType(MatchAll)
 {
     m_data.m_tagQName = tagQName.impl();
     m_data.m_tagQName->ref();
@@ -445,6 +451,7 @@ inline CSSSelector::CSSSelector(const CSSSelector& o)
     , m_isForPage(o.m_isForPage)
     , m_tagIsImplicit(o.m_tagIsImplicit)
     , m_relationIsAffectedByPseudoContent(o.m_relationIsAffectedByPseudoContent)
+    , m_linkMatchType(MatchAll)
 {
     if (o.m_match == Tag) {
         m_data.m_tagQName = o.m_data.m_tagQName;