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This test times-out on Fuchsia bots, seemingly due to an extremely long
delay in getting around to scheduling the sub-process to execute, some
of the time. Other similar ProcessUtilTests succeed because they wait
indefinitely for the sub-process to do its work; raising the timeout
to action_timeout() provides enough head-room that this test passes.

This also has the advantage that the test's timeouts are now
configurable.

Bug: 793412
Change-Id: I8b43e3cadfe302cf8afd9e835ee4ed1fbcda3c9e
Reviewed-on: https://chromium-review.googlesource.com/828383Reviewed-by: Scott Graham <scottmg@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524639}