GitLab

Add a first metric to the chrome://management page which counts how
many times the page is accessed

Bug: 879146
Change-Id: I42be7a314ebffb295069e44735913f49376edda3
Reviewed-on: https://chromium-review.googlesource.com/1243484
Commit-Queue: Stefan Teodorescu <fane@google.com>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594645}