The Copybara teams is making some changes to their service.  They need a new MDB group to be added to the permissions for our repo.

Could the following permissions be added to:
https://chromium-review.googlesource.com/admin/repos/feed

[access "refs/*"]
  ...
  push = group mdb/copybara-git-writers
  forgeAuthor = group mdb/copybara-git-writers
  forgeCommitter = group mdb/copybara-git-writer

It is also possible that the new Copybara system isn't registered as a user to Chromium's Gerrit instance.  In that case they would need to be added.  This is the information provided by the Copybara team:
stubby call blade:gerrit GerritCodeReview.RegisterUser "
    host: '$host'
    mdb_user: 'copybara-worker'
    display_name: 'Copybara Prod'
    email_address: 'copybara-worker@google.com'
  "

and then to avoid review emails they would like this as well:
 stubby call blade:gerrit GerritCodeReview.RegisterUser "
    host: '$host'
    mdb_user: 'copybara-worker'
    display_name: 'Copybara Prod'
    update_if_already_registered: true
    email_address: 'copybara-worker-blackhole@google.com'
  "

All this information is documented by the Copybara team here:
http://go/copybara-service#gerritgob-write-access