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The goal is to set up a linux-lacros-rel try builder that that runs a
subset of test suites from linux-lacros-tester-rel, so this CL creates
a virtual CI builder for linux-lacros-rel to mirror.

Bug: 1116180
Change-Id: Id9fba6c6c20d7437e4bc8b22b14dcaf28e60ee37
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2355003Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798167}