A thread safe CSS calc parser for sizes

Source/core/css/MediaValuesDynamic.cpp

Index: Source/core/css/MediaValuesDynamic.cpp
diff --git a/Source/core/css/MediaValuesDynamic.cpp b/Source/core/css/MediaValuesDynamic.cpp
index cc0e3fe2964224f2b751788fc344ae628791a85e..844c2cdc543cc1f9292ff4ad67c2330963978f07 100644
--- a/Source/core/css/MediaValuesDynamic.cpp
+++ b/Source/core/css/MediaValuesDynamic.cpp
@@ -39,6 +39,16 @@ bool MediaValuesDynamic::computeLength(double value, CSSPrimitiveValue::UnitType
         result);
 }
 
+bool MediaValuesDynamic::computeLength(double value, CSSPrimitiveValue::UnitTypes type, double& result) const
+{
+    return MediaValues::computeLength(value,
+        type,
+        calculateDefaultFontSize(m_frame),
+        calculateViewportWidth(m_frame),
+        calculateViewportHeight(m_frame),
+        result);
+}
+
 bool MediaValuesDynamic::isSafeToSendToAnotherThread() const
 {
     return false;