Add support for CSS3 "text-decoration" shorthand

Source/core/css/CSSParser.cpp

Index: Source/core/css/CSSParser.cpp
diff --git a/Source/core/css/CSSParser.cpp b/Source/core/css/CSSParser.cpp
index 7fc56703e0ac30392f93629a398a3faab28a06d3..fa7b7abf239c9b46334192c57430380ed6e2dfd9 100644
--- a/Source/core/css/CSSParser.cpp
+++ b/Source/core/css/CSSParser.cpp
@@ -2118,6 +2118,9 @@ bool CSSParser::parseValue(CSSPropertyID propId, bool important)
     }
 
     case CSSPropertyTextDecoration:
+        // [ <text-decoration-line> || <text-decoration-style> || <text-decoration-color> ] | inherit
+        return parseShorthand(CSSPropertyTextDecoration, textDecorationShorthand(), important);
+
     case CSSPropertyWebkitTextDecorationsInEffect:
     case CSSPropertyTextDecorationLine:
         // none | [ underline || overline || line-through || blink ] | inherit
@@ -8855,7 +8858,7 @@ bool CSSParser::parseTextDecoration(CSSPropertyID propId, bool important)
         return false;
 
     CSSParserValue* value = m_valueList->current();
-    if (value->id == CSSValueNone) {
+    if (value && value->id == CSSValueNone) {
         addTextDecorationProperty(propId, cssValuePool().createIdentifierValue(CSSValueNone), important);
         m_valueList->next();
         return true;
@@ -8879,7 +8882,8 @@ bool CSSParser::parseTextDecoration(CSSPropertyID propId, bool important)
             value = m_valueList->next();
     }
 
-    if (list->length() && isValid) {
+    // Values are either valid or in shorthand scope.
+    if (list->length() && (isValid || inShorthand())) {
         addTextDecorationProperty(propId, list.release(), important);
         return true;
     }