Where is FullScreenMovieScalingMode used

Trying to find reference for using Enumeration FullScreenMovieScalingMode;
I can find the enumeration itself, but can’t find the actual command that you pass values to. Is this an oversight.
It must be something that nobody uses because it doesn’t show up in the Forum.
I’m going to keep searching. Just puzzling that it’s this difficult to find.

See Unity - Scripting API: Handheld.PlayFullScreenMovie.

(I just searched in the docs for FullScreenMovie.)