GitLab

Makes ui/arc code run inside ash instead of the browser. The code
itself will be moved to //ash in follow-up CLs.

- ArcNotificationManager lives in ash::MessageCenterController;
- Arc bridge host forwards the NotificationsInstance mojo interface
  to ash via AshMessageCenterController interface;
- ArcNotificationSurfaceManager lives in ash::WaylandServerController;

Bug: 768439
Change-Id: Id3572a64cd4d8fac709cd2c22f86b392571d5041
Reviewed-on: https://chromium-review.googlesource.com/1011205
Commit-Queue: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553397}