GitLab

The code in this CL does not include handling user interaction with the
interstitials, so they will be displayed, but will not react to
commands. Bindings for commands will be added in a follow up CL.

Bug: 1016581
Change-Id: I7817205e6f48b0380e8e15a3faa9b8d134028624
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872945Reviewed-by: Daniel Rubery <drubery@chromium.org>
Reviewed-by: Changwan Ryu <changwan@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Commit-Queue: Carlos IL <carlosil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710461}