Re: [webcomponents] Shadow DOM and requestPointerLock() (#192)

@scheib the principle we try to follow is that the "light tree" cannot know about the existence of the "shadow tree". (There's a couple of exceptions to that rule, but not for normal APIs such as Fullscreen and Pointer Lock, most likely. That's why `document.fullscreenElement` would be null when an element inside one of its shadow trees is fullscreen.)

Looking over https://w3c.github.io/pointerlock/ I guess the additional complication for Pointer Lock beyond what Fullscreen has is event retargeting and what that means for movementX/Y.

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