[w3c/permissions] autoplay permission (#172)

Some web authors want to figure out whether autoplay of audible audio/video is blocked by the UA, so they can avoid downloading the video unless they're allowed to play it. Maybe the Permissions spec is a reasonable place for us to expose that? Then web authors don't have to jump through hoops to determine whether they can play?

For example, [we had a bug filed against Firefox](https://bugzilla.mozilla.org/show_bug.cgi?id=1442186) because it appears that our block autoplay implementation wasn't working with their script to detect whether autoplay worked.

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