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Adds an OpenXR perf runtime and removes the OpenVR/WMR/Oculus ones since
the latter are removed or on their way out and the former is becoming
the default.

Bug: 1124425
Change-Id: Id2c0a03e3d6ff002ce22afe9c1c7e012ee3f04e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2392939
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Auto-Submit: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804451}