Introduce few const getters for dom classes

third_party/WebKit/Source/core/svg/SVGMatrixTearOff.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 68 matching lines @@
     SVGMatrixTearOff* scaleNonUniform(double sx, double sy);
     SVGMatrixTearOff* rotate(double);
     SVGMatrixTearOff* flipX();
     SVGMatrixTearOff* flipY();
     SVGMatrixTearOff* skewX(double);
     SVGMatrixTearOff* skewY(double);
     SVGMatrixTearOff* multiply(SVGMatrixTearOff*);
     SVGMatrixTearOff* inverse(ExceptionState&);
     SVGMatrixTearOff* rotateFromVector(double x, double y, ExceptionState&);
 
-    SVGTransformTearOff* contextTransform() { return m_contextTransform; }
+    SVGTransformTearOff* contextTransform() const { return m_contextTransform; }
 
     const AffineTransform& value() const;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     explicit SVGMatrixTearOff(const AffineTransform&);
     explicit SVGMatrixTearOff(SVGTransformTearOff*);
 
     AffineTransform* mutableValue();
     void commitChange();
 
     AffineTransform m_staticValue;
 
     Member<SVGTransformTearOff> m_contextTransform;
 };
 
 } // namespace blink
 
 #endif // SVGMatrixTearOff_h