Comment 6 for bug 1331475

I think the tricky part here will be syncronizing showing the overlay with the site's chrome as we don't want it visible if the chrome is not visible.

To clarify, I mean that initially when fullscreen mode launched, the overlay and the chrome (if present) should be visible. Then tapping on the video should hide the chrome and the overlay. But what if it's a game or something and tapping the screen is not an option, then how do you hide/show the overlay?