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Still in POC stage, make chromeos-amd64-generic-lacros-chrome
run an existing tast(tast.critical-chrome) on CrOS device via Skylab.

BUG=1139516
TEST=./generate_buildbot_json.py

Change-Id: I29b9df8610f587d067c3aba831679f16bb0a4f0c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2586073
Commit-Queue: Xinan Lin <linxinan@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840249}