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To try out this code with the Microsoft OpenXR Runtime in Chromium, perform the
following steps.
    - Install 'Mixed Reality OpenXR Developer Preview' from the Microsoft Store
    - If prompted also download the compatibility pack

Add the following to custom_vars in .gclient, located at the root of the
chromium clone:
    "checkout_openxr": True
Add the following to args.gn, located in the out folder:
    enable_openxr = true

gclient sync and build

Once you've built and installed Chromium go to about:flags and:
    - Enable WebVR or WebXR
    - Enable 'OpenXR Support'

Bug: 976432
Change-Id: Ie4aa927afc7389c0a88e818889bfbcee75e4feea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1693842Reviewed-by: Brandon Jones <bajones@chromium.org>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Commit-Queue: Zheng Qin <zheqi@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#683282}