MediaStreamTrack.stop() should be async about mediacapture-extensions

[guidou]

I agree that returning a promise would be useful and allow more flexibility for implementation.

[alvestrand]

Changing the API does not seem like a good option, given that this is a rather old and stable spec by now.
Moving it to mediacapture-extensions in order to figure out how to solve the problem.

[fippo]

does that require an API change or should the user agent ensure pending closes are done before attempting to open a device?

[sonntag-philipp]

Yes, I think it would require an api change as the method signature of MediaStreamTrack.stop() would change to return a promise.
Anyway, this wouldn't affect existing uses of the method. They could just ignore the return value.