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Using typ allows us to run the tests in parallel and share
the logic for parsing the results and uploading them to the
flakiness dashboard with other python test steps.

R=dtu@chromium.org, tonyg@chromium.org, nduca@chromium.org
BUG=402172, 388256

Review URL: https://codereview.chromium.org/659293003

Cr-Commit-Position: refs/heads/master@{#302570}