Implement SetWrapperReferenceTo idl attribute within traceWrappers for svg elements

third_party/WebKit/Source/core/svg/SVGMatrixTearOff.cpp

 /*
  * 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 157 matching lines @@
 SVGMatrixTearOff* SVGMatrixTearOff::rotateFromVector(double x, double y, ExceptionState& exceptionState)
 {
     if (!x || !y)
         exceptionState.throwDOMException(InvalidAccessError, "Arguments cannot be zero.");
 
     AffineTransform copy = value();
     copy.rotateFromVector(x, y);
     return create(copy);
 }
 
+DEFINE_TRACE_WRAPPERS(SVGMatrixTearOff)
+{
+    visitor->traceWrappers(m_contextTransform);
+}
+
 } // namespace blink