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This change contains the flags, IDL definitions and blink stubs for the
WebXR Hand Input module.

https://immersive-web.github.io/webxr-hand-input/
https://github.com/immersive-web/webxr-hand-input/issues/

Subsequent changes will provide the Blink implementation, OpenXR device
implementation and test code.

Change-Id: I90169c4be02cf5daa29283a3fdf7fda6a4a2c319
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2623532
Commit-Queue: Lachlan Ford <laford@microsoft.com>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844283}