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Metrics for training are bucketed, and this CL adds parity to bucket the
metrics before scoring each link.

TBR=tbansal@chromium.org

Bug: 999897
Change-Id: I8082e9bbaff0cb3aba75273e53ed00690f9c6c06
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1779843Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Ryan Sturm <ryansturm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692389}