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There are threading problems if TestGpuServiceHolder is reused between
tests that reset the global time override. There is a race between
reading the current time and base::subtle::ScopedTimeClockOverrides
changing.

Bug: 1000251
Change-Id: I74e7776ea3dc0854d40fcd0fc7bb4bf0ecc5b5f8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1800483
Commit-Queue: kylechar <kylechar@chromium.org>
Reviewed-by: Jonathan Backer <backer@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702443}