Firefox doesnt fire the ended evt/onended callback for live video mediastreamtracks. That caused the stream storage to not run the cleanup procedure in some scenarios
Manually emit the ended event which works with the onended callback when a track is stopped
Shave off the number of calls in video-preview and video-provider by
using a stream storage
We don´t call an upfront gUM in video-preview anymore to lift the
fingerprinting barrier on device labels and IDs. Flow has been reversed:
upfront enumerate, load first preview, then check if previous
enumeration was obfuscated.
Add a stream storage in video-preview`s service to avoid re-fetching
them in video-providerj
Remove some unneeded video-preview container props
Improve some of video-preview`s error locales
Some browsers seem to (occasionally) not return the getUserMedia promise call and the
user gets stuck in this state unable to share her/his webcam.
Since enumerateDevices still works even on a gUM rejection this includes a racing
timeout that skips gUM. Configured at settings `gUMTimeout`.
Reproduced with Windows 10 Chrome 87.
