Re: [whatwg/fullscreen] Update fullscreen spec to be Shadow DOM compliant (#54)

@annevk @foolip  Could you take a look?
@hayatoito FYI

The changes are mainly 3 points:
- Replace "document" with "document tree" where necessary, to allow elements in shadow can become fullscreen
- To match `:fullscreen` against a shadow host which contain a fullscreen element in its shadow, I added sentences to set/unset "fullscreen flag" on it.
- Move `Document.fullscreenElement` to `DocumentOrShadowRoot.fullscreenElement`


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