GitLab

Design Doc: https://docs.google.com/a/chromium.org/document/d/1oQwmj3AU4QYhTyGrYEGr6zaZhHUfx-wqUgEcQGbUU-U/edit#

BUG=372607

Review URL: https://codereview.chromium.org/435293002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287600 0039d316-1c4b-4281-b951-d872f2087c98