add a Mac Builder using Python2 less bot

This builder uses
https://chromium-swarm.appspot.com/bot?id=mac-1064-g580

Bug: 1324494
Change-Id: Iaac6ead91cf080f42dc0fee0fbf9d695c33ec93f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3670677
Auto-Submit: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1007870}
NOKEYCHECK=True
GitOrigin-RevId: be40ebb0df52d17b30f878ca0898318cea301b39
2 files changed