A thread safe CSS calc parser for sizes

Source/core/css/MediaValuesCached.cpp

Index: Source/core/css/MediaValuesCached.cpp
diff --git a/Source/core/css/MediaValuesCached.cpp b/Source/core/css/MediaValuesCached.cpp
index c3aa157997a346c57a42e79f40ea28288d3bb97a..2e2811d2879200df05d2262c1d61df82a4d19a3e 100644
--- a/Source/core/css/MediaValuesCached.cpp
+++ b/Source/core/css/MediaValuesCached.cpp
@@ -77,6 +77,11 @@ bool MediaValuesCached::computeLength(double value, CSSPrimitiveValue::UnitTypes
     return MediaValues::computeLength(value, type, m_data.defaultFontSize, m_data.viewportWidth, m_data.viewportHeight, result);
 }
 
+bool MediaValuesCached::computeLength(double value, CSSPrimitiveValue::UnitTypes type, double& result) const
+{
+    return MediaValues::computeLength(value, type, m_data.defaultFontSize, m_data.viewportWidth, m_data.viewportHeight, result);
+}
+
 bool MediaValuesCached::isSafeToSendToAnotherThread() const
 {
     return hasOneRef();