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Ben looked at this recently. It'd be nice.

Ohhhhhhh, that's probably why https://chromium-review.googlesource.com/1087800 doesn't work in practice on swarming.

Thanks for pointing that out. I'll handle this.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e5ece81fab9147defb70bc3209ae8e8cd8167eeb

commit e5ece81fab9147defb70bc3209ae8e8cd8167eeb
Author: Ben Pastene <bpastene@chromium.org>
Date: Wed Jun 20 22:39:34 2018

Make test_env.py forward swarming's timeout signals.

This will let any test invoked via test_env.py on swarming handle timeouts.

This should also cover xvfb.py:
https://chromium.googlesource.com/chromium/src/+/master/testing/xvfb.py#97

Bug: 733612,  848402 
Change-Id: I33242bd6fe86072f0b32150eab6b878436252388
Reviewed-on: https://chromium-review.googlesource.com/1105022
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Marc-Antoine Ruel <maruel@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569055}
[modify] https://crrev.com/e5ece81fab9147defb70bc3209ae8e8cd8167eeb/testing/test_env.py

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/95a2d330a7d9407936e1015a8b1ae4266150e827

commit 95a2d330a7d9407936e1015a8b1ae4266150e827
Author: Andrew Grieve <agrieve@chromium.org>
Date: Thu Jun 28 02:22:59 2018

Fix crash in timeout signal handler within testing/test_env.py

Noticed this from:
https://chromium-swarm.appspot.com/task?id=3e5bfa5ea894bf10&refresh=10&show_raw=1&wide_logs=true

Post stating it's win32 only:
https://github.com/python/mypy/issues/3872

Bug: 733612
Change-Id: I7bd8fc20e4793a225e093450ba902ae525af8ac9
Reviewed-on: https://chromium-review.googlesource.com/1117858
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570999}
[modify] https://crrev.com/95a2d330a7d9407936e1015a8b1ae4266150e827/testing/test_env.py