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This gives more actionable hang reports as it allows to keep the
execution from advancing to unrelated parts of the code when we
are in the progress of capturing a hang.

Bug: 1034046
Change-Id: Ie4d5f31515fec829c527cf92ee9f723e5f940f5f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2068450
Commit-Queue: Oliver Li <olivierli@google.com>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745775}