Add bindings for MediaStreamTrack.getCapabilities

[DanielleHuisman]

Add bindings for MediaStreamTrack.getCapabilities and stabilize MediaTrackCapabilities (which it returns).

[daxpedda]

We don't stabilize proposals that aren't in the standard class.
But the addition of MediaStreamTrack.getCapabilities() is nice, but has to be added unstably.

Let me know if you have any trouble doing that or if you have any questions!

[DanielleHuisman]

Happy to make the change.

Just curious: what makes MediaStreamTrack stable, but not MediaTrackCapabilities? What specification or part of the specification indicates this?

[daxpedda]

Just curious: what makes MediaStreamTrack stable, but not MediaTrackCapabilities?

MediaStreamTrack should never have been made stable in the first place. Hindsight is 20/20 ofc.

What specification or part of the specification indicates this?

Basically we don't stabilize anything unless it has reached the last stage: "Recommended".

There is some nuance to this, where we can stabilize earlier if we are fairly confident that no API changes are coming. This mostly depends on evaluating the proposals issue tracker and if its so widely used API changes are very unlikely as they would break the Internet.

[daxpedda]

Thanks!