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The toolbar needs to update its UI when a snapshot for the side swipe
is taken.

Bug: 785756
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: If1735fe80b575608ed625dda3525a51b1689ee49
Reviewed-on: https://chromium-review.googlesource.com/809155Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522452}