GitLab

- Display() Part 2: Write notification data to database; use a real
notification ID.

- Note this is still behind the NotificationsWithMojo flag while
development continues.

Bug: 796991
Change-Id: I61d146b8f675c5e82fc7b3ea5e7782a3229f9a7c
Reviewed-on: https://chromium-review.googlesource.com/925461
Commit-Queue: Anita Woodruff <awdf@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539171}