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This will prevent tests sensitive to cold vpython startup time from
timing out.

Relands https://chromium-review.googlesource.com/c/chromium/src/+/917802 . We
expect this to work because test shards now include a hermetic copy of
cpython as well as vpython (which was the failure observed in
crbug.com/812693).

R=dpranke@chromium.org, kbr@chromium.org, tandrii@chromium.org

Bug: 804174,812693
Change-Id: Ic38845f8af366d9af211bef64df135176ab9ee1d
Reviewed-on: https://chromium-review.googlesource.com/933107Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Robbie Iannucci <iannucci@chromium.org>
Cr-Commit-Position: refs/heads/master@{#538652}