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This patch adds the logging of the ratio X/Y where

X is the size of serialized report with all UKM data omitted
Y is the size of the serialized full report

as a percentage to the UMA histogram UKM.ReportSize.NonUkmPercentage.

This is to provide us an estimate on how much of the bandwidth usage
is taken up by UKM data and non-UKM data. (Hopefully the non-UKM part is
small enough and has negligible influence on overall bandwidth usage.)

Change-Id: Ic73349e19736d326b3a585608afec07a855a2687
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2491423Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Yue Ru Sun <yrsun@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821251}