SVG doesn't recognize rem units

Source/core/svg/SVGLengthTearOff.h

Index: Source/core/svg/SVGLengthTearOff.h
diff --git a/Source/core/svg/SVGLengthTearOff.h b/Source/core/svg/SVGLengthTearOff.h
index 55feeec41df7853d6a225fb7c3bcd607a33dd1e5..8714f7b55585c9583b62679225030f03d9f37db7 100644
--- a/Source/core/svg/SVGLengthTearOff.h
+++ b/Source/core/svg/SVGLengthTearOff.h
@@ -71,6 +71,8 @@ public:
     void newValueSpecifiedUnits(unsigned short unitType, float valueInSpecifiedUnits, ExceptionState&);
     void convertToSpecifiedUnits(unsigned short unitType, ExceptionState&);
 
+    bool hasExposedLengthUnit() { return target()->unitType() <= LengthTypePC; }
+
 private:
     SVGLengthTearOff(PassRefPtrWillBeRawPtr<SVGLength>, SVGElement* contextElement, PropertyIsAnimValType, const QualifiedName& attributeName = QualifiedName::null());
 };