[dom] support iterable<> NodeList

Source/core/html/HTMLAllCollection.idl

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Samsung Electronics. 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 25 matching lines @@
     // FIXME: length and 'getter' should be inherited from HTMLCollection.
     readonly attribute unsigned long length;
     [ImplementedAs=item] getter Element (unsigned long index);
     // FIXME: The custom item() implementation may return a NodeList, but the
     // spec has a (HTMLCollection or Element)? item(DOMString name) method.
     [Custom] Element? item([Default=Undefined] optional unsigned long index);
     // FIXME:
     // FIXME: namedItem() should be a legacycaller. crbug.com/465009
     // FIXME: namedItem() should return an (HTMLCollection or Element)? union.
     [ImplementedAs=namedGetter] getter (NodeList or Element)? namedItem(DOMString name);
+    iterable<Element>;

[jsbell, 2015/07/01 18:00:30]

I don't actually see iterable<> on HTMLCollection or HTMLAllCollection in either
DOM or HTML specs. Is it under discussion? (if so, pointers?) Removed?

 };