Added parseShorthand method from the parser to CSSPropertyAPI.h.

third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp

Index: third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
diff --git a/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp b/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
index f7cd5a62aa4a02c17d56a0adf334bbd5c3ed85b9..8a622e7237ae3378e67b0346ea93ab2891ad7bb6 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
+++ b/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
@@ -2054,8 +2054,8 @@ const CSSValue* CSSPropertyParser::parseSingleValue(
     return consumeIdent(m_range);
   }
 
-  // Gets the parsing function for our current property from the property API.
-  // If it has been implemented, we call this function, otherwise we manually
+  // Gets the parsing method for our current property from the property API.
+  // If it has been implemented, we call this method, otherwise we manually
   // parse this value in the switch statement below. As we implement APIs for
   // other properties, those properties will be taken out of the switch
   // statement.
@@ -3524,6 +3524,16 @@ bool CSSPropertyParser::parseShorthand(CSSPropertyID unresolvedProperty,
                                        bool important) {
   CSSPropertyID property = resolveCSSPropertyID(unresolvedProperty);
 
+  // Gets the parsing method for our current property from the property API.
+  // If it has been implemented, we call this method, otherwise we manually
+  // parse this value in the switch statement below. As we implement APIs for
+  // other properties, those properties will be taken out of the switch
+  // statement.
+  const CSSPropertyDescriptor& cssPropertyDesc =
+      CSSPropertyDescriptor::get(property);
+  if (cssPropertyDesc.parseShorthand)
+    return cssPropertyDesc.parseShorthand(important, m_range, m_context);
+
   switch (property) {
     case CSSPropertyWebkitMarginCollapse: {
       CSSValueID id = m_range.consumeIncludingWhitespace().id();