SVG doesn't recognize rem units

Source/core/svg/SVGLengthTearOff.h

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 53 matching lines @@
     SVGLengthMode unitMode();
     float value(ExceptionState&);
     void setValue(float value, ExceptionState&);
     float valueInSpecifiedUnits();
     void setValueInSpecifiedUnits(float value, ExceptionState&);
     String valueAsString();
     void setValueAsString(const String&, ExceptionState&);
     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());
 };
 
 } // namespace blink
 
 #endif // SVGLengthTearOff_h