Re: [permissions] Mediacapture permissions (#57)

> +     PermissionDescriptor'>
> +   <dt>
> +     DOMString deviceId
> +   </dt>
> + </dl>
> + <p>A permission covers access to the device given in the
> + associated descriptor.
> + </p>
> + <p>
> +   If the descriptor does not have a deviceId, its semantic is that
> +   it queries for access to any device of that class.
> + </p>
> + <p>
> +   If the deviceId is the special string "*", it queries for
> +   access to all devices of that class, whether they exist
> +   at the moment or are attached at a later time. When such a

Is the difference between an absent deviceId and a deviceId of "*" that absence is "devices of this class that are here now" and "*" means "devices of this class, no matter their current presence"

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