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Hang reports show that there can be contention on the pool lock when
a thread is created in a scope where it is held. To avoid this
contention, this CL ensures that no lock is held when
SchedulerWorker::Start() is called.

Bug: 905288
Change-Id: I4158fb061e6c0ec0de820bd061c1cc5b2d309e6b
Reviewed-on: https://chromium-review.googlesource.com/c/1355427Reviewed-by: Etienne Pierre-Doray <etiennep@chromium.org>
Commit-Queue: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612809}