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This change records UKM, AdsIntervention_LastIntervention on page loads
to origins that have previously triggered ads interventions. This UKM
tracks the subresource filter activation status and the ads violation
that triggered the intervention.

This allows analysis of an ads interventions benefit to a user and
their frequency across different sets of sites.

BUG=1099741

Change-Id: I653b0468c387727902f95e00c14cba1da9ae6996
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2419118
Commit-Queue: Justin Miron <justinmiron@google.com>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820343}