Re: [w3c/webcomponents] fullscreenchange should be dispatched on each ancestor shadow root (#614)

@annevk : It would mean that if you had 100 shadow trees, you may end up with 100 event listeners on document coming from each shadow tree to if one of the shadow tree’s element got fullscreen’ed or not.  It would be much cleaner if each shadow root had its own event listener which listens to `fullscreenchange` event that happens in its own shadow tree.

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