[Bug 25298] How to represent VideoFacingMode if browser is not able to detect the FacingMode of the camera.

https://www.w3.org/Bugs/Public/show_bug.cgi?id=25298

--- Comment #9 from Jan-Ivar Bruaroey [:jib] <jib@mozilla.com> ---
Just to take both positions here, one argument FOR "unknown" would be to
future-proof so we can add new enum values in the future. This would rely on
Bug 19936 being addressed, which would let us write:

enum VideoFacingModeEnum {
    "user",
    "environment",
    "left",
    "right",
    "unknown" = default
};

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