GitLab

This makes the header accessible to all platform clients.
Preparation for https://crrev.com/c/1238465

Bug: 739170
Change-Id: Ia30feccae93704f734f0892a8f654f711e3f7251
Reviewed-on: https://chromium-review.googlesource.com/1240315
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593786}