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Doing it this way to get more correct metrics around coverage and to
verify against server metrics for when this reactive prefetch can trigger

TBR=jwd@chromium.org

Change-Id: Ie8dc14673ea905c5a51e6fc130857e5255840da7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2599445
Commit-Queue: Sophie Chang <sophiechang@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839678}