[SVG2] Add getters and setters to SVG*List interfaces.

Source/core/svg/SVGStringList.idl

 /*
  * Copyright (C) 2006 Apple 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 10 matching lines @@
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 [
     StrictTypeChecking,
     SetWrapperReferenceTo(SVGElement contextElement),
     ImplementedAs=SVGStringListTearOff
 ] interface SVGStringList {
-    readonly attribute unsigned long numberOfItems;
+    readonly attribute unsigned long length;
+    [ImplementedAs=length] readonly attribute unsigned long numberOfItems;
 
     [RaisesException] void clear();
     [RaisesException] DOMString initialize(DOMString item);
-    [RaisesException] DOMString getItem(unsigned long index);
+    [RaisesException] getter DOMString getItem(unsigned long index);
+    [RaisesException] setter DOMString (unsigned long index, DOMString value);
     [RaisesException] DOMString insertItemBefore(DOMString item, unsigned long index);
     [RaisesException] DOMString replaceItem(DOMString item, unsigned long index);
     [RaisesException] DOMString removeItem(unsigned long index);
     [RaisesException] DOMString appendItem(DOMString item);
 };