GitLab

* All Mac bots use Mac-10.13 as os.
* Android device bots use id:<bot name> as dimensions

Bug: 840631
Change-Id: I0ea523e0b4f1f91f20c7f32333ec2db6ab486b03
Reviewed-on: https://chromium-review.googlesource.com/1100070Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Commit-Queue: Ryan Tseng <hinoka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567055}