It's probably also the kind of fancy glass you can get to go foggy on command (hopefully it's fail foggy, i.e. needs a small charge to be clear) so that when you latch the door the stall becomes private.
I hate going into a bathroom and needing to softly push/pull on each door lightly enough to avoid letting someone who may be sitting on the other side know I'm checking whether the stall is occupied.
Edit: I know many stalls have the green/red slider, but those are often hard to read, and I can immediately see which stalls are empty with the glass ones, without needing to walk up close enough to read the dial.
Just do like my ex-coworkers and go mental on every doorhandle untill they find an empty stall. It's probably to scare the shit out of me, to make it go faster.
These are the new and updated "American Privacy Toilets^TM ", where past complaints of doors not reaching all the way to the floor and ceiling has been addressed and tolerances have been adjusted to avoid other people from peeking in.