Re: VideoStreamTrack: takePhoto()

It seems to me easy to add support for futures later, right? As in, we
could ship the existing callback-based API and later the browser
implementation can switch to futures internally, expose a DOM Futures API
and easily also continue supporting the old API on top of futures.
Suboptimal but not disastrous.

(This is different to mistakes like UTF-16, where widespread use of
charAt()-like APIs makes switching implementations to UTF8 strings very
challenging.)

Rob
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