1 files changed, 16 insertions, 1 deletions
diff --git a/Source/WebCore/css/CSSFunctionValue.cpp b/Source/WebCore/css/CSSFunctionValue.cpp
index 3877f6da9..31861b336 100644
--- a/Source/WebCore/css/CSSFunctionValue.cpp
+++ b/Source/WebCore/css/CSSFunctionValue.cpp
@@ -40,7 +40,7 @@ CSSFunctionValue::CSSFunctionValue(CSSParserFunction* function)
         m_args = CSSValueList::createFromParserValueList(*function->args);
 }
 
-CSSFunctionValue::CSSFunctionValue(String name, PassRefPtr<CSSValueList> args)
+CSSFunctionValue::CSSFunctionValue(const String& name, PassRefPtr<CSSValueList> args)
     : CSSValue(FunctionClass)
     , m_name(name)
     , m_args(args)
@@ -62,4 +62,19 @@ bool CSSFunctionValue::equals(const CSSFunctionValue& other) const
     return m_name == other.m_name && compareCSSValuePtr(m_args, other.m_args);
 }
 
+bool CSSFunctionValue::buildParserValueSubstitutingVariables(CSSParserValue* result, const CustomPropertyValueMap& customProperties) const
+{
+    result->id = CSSValueInvalid;
+    result->unit = CSSParserValue::Function;
+    result->function = new CSSParserFunction;
+    result->function->name.init(m_name);
+    bool success = true;
+    if (m_args) {
+        CSSParserValueList* argList = new CSSParserValueList;
+        success = m_args->buildParserValueListSubstitutingVariables(argList, customProperties);
+        result->function->args.reset(argList);
+    }
+    return success;
+}
+
 }