[whatwg/fullscreen] User agent needs latitude to end fullscreen when needed (#93)

Right now, there doesn't seem to be any leeway in the spec for the user agent to unilaterally decide to end fullscreen for an element. 

I know that we do this already in Chromium: if a page spawns a pop-up window, we drop fullscreen. I'm arguing in a [Blink Intent](https://groups.google.com/a/chromium.org/d/msg/blink-dev/waIh70rrNKM/YzfvTGLvBgAJ) that the same should be done for when a page spawns a dialog. But whatever your position is on that particular Intent, surely the ability for a UA to decide that in certain situations, it needs to force an end to fullscreen needs to be there.

@foolip suggested in a post as one of a list of options:

> Something more handwavy in https://fullscreen.spec.whatwg.org/#ui giving the UA a license to exit whenever it thinks it's in the best interest of the user.

The other option was a specific one about the Intent, but I think this wider option is appropriate.

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