Review Mozilla 1692873: is screenshare simulcast supported?

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Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1692873

Description

From the 134 release notes:

WebRTC simulcast of screen-shared video with the VP8 codec is now supported (simulcast from other video sources has been enabled for a long time). More precisely, MediaStreamTrack objects for screen and window capture (for example, from MediaDevices.getDisplayMedia()), can now be encoded as multiple simulcast layers when using VP8. (Firefox bug 1692873).

So, new codec supported. We probably want to audit it.

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