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We would like to understand approximately how many screenshots users are
taking per day and per week. This will inform how may screenshots we
choose to show in the holding space feature currently under development.

Note that we are also adding similar histograms to ScreenshotController
so these metrics may also be useful to measure impact of capture mode.

Bug: 1131266
Change-Id: Iddab5573aba57402f21ab270f8467c710d9affec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438679
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812051}