Add property parser code path based on CSSParserTokenRange

Source/core/css/parser/CSSParserToken.h

Index: Source/core/css/parser/CSSParserToken.h
diff --git a/Source/core/css/parser/CSSParserToken.h b/Source/core/css/parser/CSSParserToken.h
index d9188fa17a13e6336c8762400f8f11c42c825ef3..c3b65384f600d826b61686b2cbf2e21424250065 100644
--- a/Source/core/css/parser/CSSParserToken.h
+++ b/Source/core/css/parser/CSSParserToken.h
@@ -106,6 +106,7 @@ public:
     CSSPrimitiveValue::UnitType unitType() const { return static_cast<CSSPrimitiveValue::UnitType>(m_unit); }
     UChar32 unicodeRangeStart() const { ASSERT(m_type == UnicodeRangeToken); return m_unicodeRange.start; }
     UChar32 unicodeRangeEnd() const { ASSERT(m_type == UnicodeRangeToken); return m_unicodeRange.end; }
+    CSSValueID id() const;
 
     CSSPropertyID parseAsUnresolvedCSSPropertyID() const;
 
@@ -134,6 +135,7 @@ private:
         UChar m_delimiter;
         HashTokenType m_hashTokenType;
         double m_numericValue;
+        mutable int m_id;
 
         struct {
             UChar32 start;