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This forms the basis of the WebXR Input system when used in Magic Window
mode.

Bug: 812287
Change-Id: Ibea7df8b173e378c563e011de23ab6bc5448af9f
Reviewed-on: https://chromium-review.googlesource.com/952230
Commit-Queue: Brandon Jones <bajones@chromium.org>
Reviewed-by: Bill Orr <billorr@chromium.org>
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543860}