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This flag allows us to configure OpenXR features which, though shipped
on Android/ARCore may not be ready to be shipped on Desktop/OpenXR, due
to the slightly different permissions, or due to an inability for us to
actually test on real hardware.

Change-Id: I985f2e17119185053539f6c2671695c57081c24f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537584Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827549}