GitLab

This is a step towards allowing WebUI to directly embed guest views. 

BUG=386838
R=fsamuel@chromium.org

Review URL: https://codereview.chromium.org/426593007

Cr-Commit-Position: refs/heads/master@{#288407}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288407 0039d316-1c4b-4281-b951-d872f2087c98