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Currently OpenXR tests are flaky because XrInstance is created and
destroyed multiple times. There is also a performance issue because
every time XrCreateInstance called, it will load dlls. The solution is
create a OpenXrStatic class to host the xr instance and static methods.
And have one copy of OpenXrStatic in render process another in where
static functions getting called.


Bug: 1011871
Change-Id: I69843cebaeee9e4b7f30806f431b4ea93182ebca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865727
Commit-Queue: Zheng Qin <zheqi@microsoft.com>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708505}