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After completing DxDiag, DX12/Vulkan and DevicePerfInfo requests,
the info-collection GPU process will shut down atomically.

Before this CL, the info-collection GPU process always goes through the
slow non-atomic shutdown procedure, which causes a crash when an
exception is raised during shutdown.

Bug: 1045920
Change-Id: I4dc3041fc940301735e248a52184749be0ef2e91
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2151829Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Maggie Chen <magchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759755}