window.scroll() without params should be ignored or throw an error

Source/core/frame/Window.idl

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2011 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 75 matching lines @@
     [Replaceable] readonly attribute long innerWidth;
     [Replaceable] readonly attribute long screenX;
     [Replaceable] readonly attribute long screenY;
     [Replaceable] readonly attribute long screenLeft;
     [Replaceable] readonly attribute long screenTop;
     [Replaceable] readonly attribute long scrollX;
     [Replaceable] readonly attribute long scrollY;
     readonly attribute long pageXOffset;
     readonly attribute long pageYOffset;
 
-    void scrollBy([Default=Undefined] optional long x, [Default=Undefined] optional long y);
-    void scrollTo([Default=Undefined] optional long x, [Default=Undefined] optional long y);
-    void scroll([Default=Undefined] optional long x, [Default=Undefined] optional long y);
+    void scrollBy([Default=Undefined] long x, [Default=Undefined] long y);

[Inactive, 2013/11/05 19:34:01]

It does not make sense to keep [Default=Undefined] if the argument is no longer
optional.

+    void scrollTo([Default=Undefined] long x, [Default=Undefined] long y);
+    void scroll([Default=Undefined] long x, [Default=Undefined] long y);
     void moveBy([Default=Undefined] optional float x, [Default=Undefined] optional float y); // FIXME: this should take longs not floats.
     void moveTo([Default=Undefined] optional float x, [Default=Undefined] optional float y); // FIXME: this should take longs not floats.
     void resizeBy([Default=Undefined] optional float x, [Default=Undefined] optional float y); // FIXME: this should take longs not floats.
     void resizeTo([Default=Undefined] optional float width, [Default=Undefined] optional float height); // FIXME: this should take longs not floats.
 
     [DoNotCheckSecurity] readonly attribute boolean closed;
 
     [Replaceable, DoNotCheckSecurityOnGetter] readonly attribute unsigned long length;
 
     attribute DOMString name;
@@ skipping 125 matching lines @@
 
     [ImplementedAs=anonymousIndexedGetter, NotEnumerable] getter Window(unsigned long index);
     [Custom, NotEnumerable] getter Window (DOMString name);
 };
 
 Window implements GlobalEventHandlers;
 Window implements ImageBitmapFactories;
 Window implements WindowBase64;
 Window implements WindowEventHandlers;
 Window implements WindowTimers;