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The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5f370ab2916f7e543d05c4629e7f1be7b5968933

commit 5f370ab2916f7e543d05c4629e7f1be7b5968933
Author: edchin <edchin@chromium.org>
Date: Wed May 16 05:32:41 2018

[ios] Animate Undo Close All

This CL adds an animation to
1) tabs when inserting them to the tab grid.
2) empty state view by fading it away.

These animations are not specifically for undo only, but rather for
whenever the tab grid goes from being empty to having a tab or tabs.

Video:
https://drive.google.com/open?id=17DgaYbJNAE3cjuW41TQ3Aafl6B-kxDU1

Bug:  804568 
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I413cff014c2cbbfc243f9f37b424ccfd97a277d9
Reviewed-on: https://chromium-review.googlesource.com/1054628
Commit-Queue: edchin <edchin@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558989}
[modify] https://crrev.com/5f370ab2916f7e543d05c4629e7f1be7b5968933/ios/chrome/browser/ui/tab_grid/grid/grid_layout.mm
[modify] https://crrev.com/5f370ab2916f7e543d05c4629e7f1be7b5968933/ios/chrome/browser/ui/tab_grid/grid/grid_view_controller.mm

The NextAction date has arrived: 2018-05-23