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When initializing the OpenXR runtime, send the LUID of the GPU adapter
the VR headset is plugged into back to the browser process. This change
is one part of a series of changes to add multi-GPU support for VR.
crrev.com/c/2216166 added the LUID of the GPU that the GPU process is
using. A subsequent CL will compare these two LUIDs to determine
whether the GPU process needs to be restarted and initialized on the
correct GPU to be XR compatible.

This change adds a XRDeviceData struct that wraps around a LUID so
that the LUID is only enabled on Windows with minimal
"#if defined(OS_WIN)" wrappers. A subsequent change specified by
crbug.com/1090029 will consolidate all information about an XR device
into this XRDeviceData struct.

Bug: 792657
Change-Id: If38fd6d0b16c39b36d529d4aaa02c22fe0bcff0a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225366
Commit-Queue: Patrick To <patrto@microsoft.com>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Alex Gough <ajgo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#776324}