GitLab

I didn't move cocoa impl because that's not necessary.

BUG=380438
R=sky@chromium.org

Review URL: https://codereview.chromium.org/447243004

Cr-Commit-Position: refs/heads/master@{#288281}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288281 0039d316-1c4b-4281-b951-d872f2087c98