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This CL adds an Earl Grey test to ensure that the toolbar buttons and
the toolbar visibility is correctly updated when the size class changes.

Bug: 804726
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Iee3937485ddf379695fabe420ce3311ddea4aba3
Reviewed-on: https://chromium-review.googlesource.com/919061Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537775}