Re: [dom] Add EventListenerOptions and passive event listeners (#82)

>  method, when invoked, must run these steps:
>  
>  <ol>
>   <li><p>If <var>callback</var> is null, terminate these steps.
>  
> + <li>If <var>options</var> is of type boolean, let <var>capture</var> be
> + <var>options</var> and let <var>passive</var> be false.  Otherwise let
> + <var>capture</var> and <var>passive</var> be the corresponding values in the
> + <var>options</var> {{EventListenerOptions}} dictionary.

That is not justification for having default values in the IDL though.

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