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 ba72614df31d56bf54518ba0369b639e7d0463bd..2a22a665190d9527da7785b0d923b57635b61fa2 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
+++ b/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
@@ -41,6 +41,7 @@
 #include "core/css/parser/CSSPropertyParserHelpers.h"
 #include "core/css/parser/CSSVariableParser.h"
 #include "core/css/parser/FontVariantLigaturesParser.h"
+#include "core/css/properties/CSSPropertyAPI.h"
 #include "core/css/properties/CSSPropertyAlignmentUtils.h"
 #include "core/css/properties/CSSPropertyColumnUtils.h"
 #include "core/css/properties/CSSPropertyDescriptor.h"
@@ -2258,8 +2259,10 @@ const CSSValue* CSSPropertyParser::parseSingleValue(
   // statement.
   const CSSPropertyDescriptor& cssPropertyDesc =
       CSSPropertyDescriptor::get(property);
-  if (cssPropertyDesc.temporaryCanReadValue)
+  if (FUNCTION_IMPLEMENTED_FOR_PROPERTY(parseSingleValue, cssPropertyDesc) &&
+      cssPropertyDesc.parseSingleValue) {
     return cssPropertyDesc.parseSingleValue(m_range, m_context);
+  }
 
   switch (property) {
     case CSSPropertyWebkitHighlight:
@@ -3808,6 +3811,17 @@ bool CSSPropertyParser::parseShorthand(CSSPropertyID unresolvedProperty,
                                        bool important) {
   CSSPropertyID property = resolveCSSPropertyID(unresolvedProperty);
 
+  // Gets the parsing function for our current property from the property API.
+  // If it has been implemented, we call this function, 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 (FUNCTION_IMPLEMENTED_FOR_PROPERTY(parseShorthand, cssPropertyDesc) &&
+      cssPropertyDesc.parseShorthand) {
+    return cssPropertyDesc.parseShorthand(important, m_range, m_context);
+  }
   switch (property) {
     case CSSPropertyWebkitMarginCollapse: {
       CSSValueID id = m_range.consumeIncludingWhitespace().id();