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This change also adds a timeout for generating the manifest (5 minutes),
so that failures (e.g. bug 1161274) do not just silently hang at
'Collecting tests...'.

Bug: 1161274
Change-Id: I55e2cfb37b230135694a3ad4a5f95a1cc2fdaa58
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2611124
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Auto-Submit: Stephen McGruer <smcgruer@chromium.org>
Reviewed-by: Robert Ma <robertma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840262}