GitLab

Enables monochrome_public_test_ar_apk on Oreo Phone Tester and adds in
the necessary changes to download ArCore and include it in the isolate.

Bug: 851020
Change-Id: Id98519c43acc3ec4ee203c78e04457d8cd6f92ad
Reviewed-on: https://chromium-review.googlesource.com/1136028Reviewed-by: Ian Vollick <vollick@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578741}