[mediacapture-output] Should the spec define specific static audio output device IDs (#93)

youennf has just created a new issue for https://github.com/w3c/mediacapture-output:

== Should the spec define specific static audio output device IDs ==
It might be useful to define specific values for audio output device IDs.
Such values could be:
- 'default' or '', https://github.com/w3c/mediacapture-output/issues/85
- 'earpiece' (and potentially 'speaker'), most useful for phones that have both a loudspeaker and an earpiece
- 'none': mute a whole page


Please view or discuss this issue at https://github.com/w3c/mediacapture-output/issues/93 using your GitHub account