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Gives the test 5min to finish, and retries up to two more times. I'm
pretty confident this'll cover all current flakes.

Change-Id: I1a706b315f3ee029a6530510facd8b2dfd9de4f5
Reviewed-on: https://chromium-review.googlesource.com/1102121
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Reviewed-by: Marc-Antoine Ruel <maruel@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568067}