GitLab

On close the launcher should animate to the shelf height and the
contents of the launcher should shift their opacity to 0.

In side shelf mode the launcher has a different animation, the whole app
list shifts in opacity to 0 with no movement.

Bug: 754072
Change-Id: I245b4fa8b5dd26644d87b5f5717df73fc7dc3742
Reviewed-on: https://chromium-review.googlesource.com/619596Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#496527}