GitLab

This CL adds a new animator, FullscreenForegroundAnimator that is sent
to FullscreenControllerObservers upon receipt of an application
foreground notification.  This CL also updates FullscreenUIElements
to show the toolbar using this animator.

Bug: 806694
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I9470602d5535964ea0a054c949ccaba0225e5ed3
Reviewed-on: https://chromium-review.googlesource.com/894355
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533198}