Add null-correctness checking to [StrictTypeChecking] methods

Source/core/svg/SVGMatrix.idl

 /*
  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  * 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 14 matching lines @@
 ] interface SVGMatrix {
     // FIXME: these attributes should all be floats but since we implement
     // AffineTransform with doubles setting these as doubles makes more sense.
     [StrictTypeChecking] attribute double a;
     [StrictTypeChecking] attribute double b;
     [StrictTypeChecking] attribute double c;
     [StrictTypeChecking] attribute double d;
     [StrictTypeChecking] attribute double e;
     [StrictTypeChecking] attribute double f;
 
-    [StrictTypeChecking] SVGMatrix multiply(SVGMatrix secondMatrix);
+    [StrictTypeChecking] SVGMatrix multiply(SVGMatrix? secondMatrix);

[kouhei (in TOK), 2014/01/17 04:28:45]

No ? here.

     [RaisesException] SVGMatrix inverse();
     [Immutable, StrictTypeChecking] SVGMatrix translate(float x, float y);
     [Immutable, StrictTypeChecking] SVGMatrix scale(float scaleFactor);
     [Immutable, StrictTypeChecking] SVGMatrix scaleNonUniform(float scaleFactorX, float scaleFactorY);
     [Immutable, StrictTypeChecking] SVGMatrix rotate(float angle);
     [StrictTypeChecking, RaisesException] SVGMatrix rotateFromVector(float x, float y);
     [Immutable] SVGMatrix flipX();
     [Immutable] SVGMatrix flipY();
     [Immutable, StrictTypeChecking] SVGMatrix skewX(float angle);
     [Immutable, StrictTypeChecking] SVGMatrix skewY(float angle);
 };