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This new FamilyUserMetricsProvider will filter the Family Experiences
team's metrics by categories of interest. The categories represent
various combinations of supervised and K-12 EDU user types as primary
and secondary accounts.

Bug: 1103077
Change-Id: I96ee444b7847e06264ce2afab64dbf588e404a05
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2317739
Commit-Queue: Toby Huang <tobyhuang@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Aga Wronska <agawronska@chromium.org>
Reviewed-by: Pavol Marko <pmarko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805339}