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These histograms are not actively used. Most of the time, no tab is
discarded in a 10 minutes interval. To assess the impact of future
changes to the discarding logic, it would be more useful to report
the number of discards and reloads per day.

Bug: 1088709
Change-Id: Ia1b2573c154e0b01c9b6d6039a9b2c041db94b48
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2514467Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823887}