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Metric reports the time a NTP is on screen.
Incognito NTP are not reported.

Bug: 1131209
Change-Id: I25fb6bb004efd89cbef855e2455c71f616986e55
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2487105
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Chris Lu <thegreenfrog@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824131}