Add property parser code path based on CSSParserTokenRange

Source/core/css/parser/CSSParserToken.cpp

Index: Source/core/css/parser/CSSParserToken.cpp
diff --git a/Source/core/css/parser/CSSParserToken.cpp b/Source/core/css/parser/CSSParserToken.cpp
index e1ea4ec979816bdae879841790e2f52d6ae1723b..e383267dabb612cab17b747dc75707069aee4326 100644
--- a/Source/core/css/parser/CSSParserToken.cpp
+++ b/Source/core/css/parser/CSSParserToken.cpp
@@ -33,6 +33,7 @@ CSSParserToken::CSSParserToken(CSSParserTokenType type, CSSParserString value, B
     , m_blockType(blockType)
 {
     initValueFromCSSParserString(value);
+    m_id = -1;
 }
 
 CSSParserToken::CSSParserToken(CSSParserTokenType type, double numericValue, NumericValueType numericValueType, NumericSign sign)
@@ -110,6 +111,24 @@ CSSPropertyID CSSParserToken::parseAsUnresolvedCSSPropertyID() const
     return unresolvedCSSPropertyID(value());
 }
 
+CSSValueID CSSParserToken::id() const
+{
+    if (m_type != IdentToken)
+        return CSSValueInvalid;
+    if (m_id < 0)
+        m_id = cssValueKeywordID(value());
+    return static_cast<CSSValueID>(m_id);
+}
+
+CSSValueID CSSParserToken::functionId() const
+{
+    if (m_type != FunctionToken)
+        return CSSValueInvalid;
+    if (m_id < 0)
+        m_id = cssValueKeywordID(value());
+    return static_cast<CSSValueID>(m_id);
+}
+
 void CSSParserToken::serialize(StringBuilder& builder) const
 {
     // This is currently only used for @supports CSSOM. To keep our implementation