infra: Add Chromium Android ARM 32-bit Goma RBE ToT ATS

R=dpranke@chromium.org, hinoka@chromium.org, jbudorick@chromium.org

Bug: 915568
Change-Id: I34e1cd438423e614db0652ff3c17f0832e8a6a82
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1500714
Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Simon Que <sque@chromium.org>
Cr-Commit-Position: refs/heads/master@{#637587}
4 files changed