Local NTP: Add histogram NewTabPage.OneGoogleBar.ShownTime

Bug: 583292
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Ia6de50ccd0393c37a946765ebb1d530b2e1059cb
Reviewed-on: https://chromium-review.googlesource.com/695343
Reviewed-by: Chris Pickel <sfiera@chromium.org>
Reviewed-by: Jesse Doherty <jwd@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506346}
4 files changed