[w3c/pointerlock] Update for Shadow DOM (#4)

See discussion about this change at:
https://github.com/w3c/webcomponents/issues/192

Splits Document.pointerLockElement into Document.pointerLockElement and
ShadowRoot.pointerLockElement and encapsulates shadow tree from
document.

Other than split, replaces document to 'shadow-including document' where
necessary.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/pointerlock/pull/4

-- Commit Summary --

  * Update for Shadow DOM

-- File Changes --

    M index.html (52)

-- Patch Links --

https://github.com/w3c/pointerlock/pull/4.patch
https://github.com/w3c/pointerlock/pull/4.diff

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