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If a delayed task is posted from a non-main thread and task queue time
recording is enabled, we attempt to grab the "any thread" lock twice,
leading to a deadlock. This patch reduces the scope of the lock to avoid
the problem.

Original fix from Alexander Timin <altimin@chromium.org>.

Bug: 891670
Change-Id: I5af0c2016a12b061c523b8b51c16ff23a8f3a41f
Reviewed-on: https://chromium-review.googlesource.com/c/1344144Reviewed-by: Alex Clarke <alexclarke@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610000}