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This CL adds an Earl Grey test to check the interactions between the
infobars and the bottom adaptive toolbar.

Bug: 804747
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ife30026fd1390d4b86896aca2f7f0f33407926cc
Reviewed-on: https://chromium-review.googlesource.com/955023
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541795}