Add null-correctness checking to [StrictTypeChecking] methods

Source/core/svg/SVGTransform.idl

 /*
  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  * Copyright (C) 2006 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 15 matching lines @@
     const unsigned short SVG_TRANSFORM_TRANSLATE = 2;
     const unsigned short SVG_TRANSFORM_SCALE = 3;
     const unsigned short SVG_TRANSFORM_ROTATE = 4;
     const unsigned short SVG_TRANSFORM_SKEWX = 5;
     const unsigned short SVG_TRANSFORM_SKEWY = 6;
 
     readonly attribute unsigned short type;
     [ImplementedAs=svgMatrix] readonly attribute SVGMatrix matrix;
     readonly attribute float angle;
 
-    [StrictTypeChecking] void setMatrix(SVGMatrix matrix);
+    [StrictTypeChecking] void setMatrix(SVGMatrix? matrix);
     [StrictTypeChecking] void setTranslate(float tx, float ty);
     [StrictTypeChecking] void setScale(float sx, float sy);
     [StrictTypeChecking] void setRotate(float angle, float cx, float cy);
     [StrictTypeChecking] void setSkewX(float angle);
     [StrictTypeChecking] void setSkewY(float angle);
 };