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Specifically adding a new NewTabPage.MainUi.ShownTime histogram.

Fixed: 1141327
Change-Id: Ide414b94c8273e19448ef8251bcede671792ef82
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533643Reviewed-by: Alex Gough <ajgo@chromium.org>
Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Alex Gough <ajgo@chromium.org>
Commit-Queue: dpapad <dpapad@chromium.org>
Auto-Submit: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826952}