Re: [heycam/webidl] Need pattern for feature detecting dictionary members (#107)

FWIW we had this exact problem with `getUserMedia(constraints)`. We ended up defining [`navigator.mediaDevices.getSupportedConstraints()`](http://w3c.github.io/mediacapture-main/getusermedia.html#widl-MediaDevices-getSupportedConstraints-MediaTrackSupportedConstraints). The implementation was [quite trivial](http://mxr.mozilla.org/mozilla-central/source/dom/media/MediaDevices.h?rev=e22b3043887e#36). :)

Still, that seems like a lot of bloat on the window.

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