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The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/51af0d4a392a5c7bdaf715bdad4d5b2685075ecc

commit 51af0d4a392a5c7bdaf715bdad4d5b2685075ecc
Author: edchin <edchin@chromium.org>
Date: Mon May 07 16:57:32 2018

[ios] Add undo close all egtest

Previously, an alert was presented as a stub to the undo close all
action.

This CL updates the egtest to check that the undo operation actually
worked, now that the undo close all operation is fully implemented.
There already exists more extensive unittesting on the undo close all
operation.

Bug:  804569 
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: If30ec4fb457ccfad259f8b79a5a45e9db43a9a1e
Reviewed-on: https://chromium-review.googlesource.com/1045227
Reviewed-by: edchin <edchin@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556473}
[modify] https://crrev.com/51af0d4a392a5c7bdaf715bdad4d5b2685075ecc/ios/chrome/browser/ui/tab_grid/tab_grid_egtest.mm

The NextAction date has arrived: 2018-05-09