[w3c/screen-orientation] Face up and face down (#168)

iOS supports face up and face down events: 

<img width="594" alt="Screenshot 2019-03-10 20 33 06" src="https://user-images.githubusercontent.com/870154/54098891-c19b6f00-4373-11e9-9eb1-58e6560e46da.png">

Which makes for some interesting use cases: yesterday I played a game at a bar with friends where one person holds the phone on their forehead with a trivia answer -  the other players then shout clues at the person holding the phone in order for the person holding the phone to try to guess what the phone says (e.g., "It meows!" to guess "Cat"). 

If the player doesn't know the answer, they can rotate the phone face up to "pass" to the the next question - otherwise, if they guess correctly, they turn the phone face down as a way of indicating that they've guessed correctly. 

This use case is interesting in that it requires orientation locking in to landscape, the but then also requires the phone to fire orientation change events specifically for "face down" and "face up".  

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https://github.com/w3c/screen-orientation/issues/168