Re: [whatwg/fullscreen] Allow fullscreen to be triggered by an orientation change event (#34)

Let me raise another question: what are other dangerous features which currently require and only require a user gesture to activate?

@mounirlamouri's example on the top of this issue is gUM, but as far as I can see, `getUserMedia` does not require a user gesture at all, not in Firefox, Chrome, or Edge. Asking for access to camera or microphone would always require an explicit approval from the user, rather than a simple user gesture. And given the requirement of an explicit approval, whether it is from a user gesture is not relevant.

Having said this, I think the right way to go for now is probably to make orientation change event a user gesture in the HTML spec, not an exception here. But the question @foolip just raised also needs consideration. It seems to me that the timing of firing `change` event in the current Screen Orientation API spec isn't clear enough. I think that timing need to be clear before it can be added as a user gesture.

 (Actually, I don't think browsers follow the spec for what is considered as a user gesture. For example, `keypress` is not listed there, but I believe all browsers consider that event as a user gesture for opening popup and entering fullscreen, and holding back that would certainly break the web. At least Youtube uses keypress for fullscreen.)

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