GitLab

There is no spec for this, but an old open spec issue:
https://github.com/whatwg/fullscreen/issues/15

Bug: 787867
Change-Id: Icde796405fca96e910480aef6f0d6be835f7a27a
Reviewed-on: https://chromium-review.googlesource.com/788052
Commit-Queue: Philip Jägenstedt <foolip@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520620}