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This CL adds initial IDL for the navigator.hid object which is
enabled under the experimental web platform features flag.
(chrome://flags/#enable-experimental-web-platform-features)

A FeaturePolicyFeature is also added to control access to HID
within the renderer.

BUG=890096

Change-Id: If75aefdd7dcaaad06ae56cff8d898d0bea0f83a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1441992
Commit-Queue: Matt Reynolds <mattreynolds@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638434}