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Adds a new metric that logs users focusing and immediately defocusing
the omnibox without changing it or copying it. This should allow to see
the regression when the steady state location bar will be introduced.

Bug: 837164
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Icf177b57ca1781930e21c57f9c40dc829aac0982
Reviewed-on: https://chromium-review.googlesource.com/1030190Reviewed-by: Brian White <bcwhite@chromium.org>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556399}