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This CL supports running lacros tast tests in
build/chromeos/test_runner.py, and the main motivation is to run lacros
tast tests on Chromium CI.

Bug: 1158590
Change-Id: I8c63c57b95aee5b4c75a4e4561d4afda9d9f3432
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2605239
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841256}