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When any button of the toolbar is pressed, the event should be logged.
Also if the omnibox is being edited, the edit mode should be removed.
This CL adds a method to add those actions to all buttons.

Bug: 795257
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: If6b34153b6f2fcaa7fa9037f26a7f0a15ab75da2
Reviewed-on: https://chromium-review.googlesource.com/829315Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524682}