Add a VM test timeout

When VM test hangs, it would eventually get killed with no output or
archived artifacts for debugging. This CL wraps VM test with a
timeout, so that test artifacts can be archived by cbuildbot in this
case.

BUG=chromium:370224
TEST=`buildbot/run_tests` passes

Change-Id: Ib55ab061c14e6325b961261797c41530c6695400
Reviewed-on: https://chromium-review.googlesource.com/198288
Reviewed-by: David James <davidjames@chromium.org>
Commit-Queue: Yu-Ju Hong <yjhong@chromium.org>
Tested-by: Yu-Ju Hong <yjhong@chromium.org>
1 file changed