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In this CL, we record more information, field trails to the Persistent histogram
data in the reduced mode.

Bug: 965482
Change-Id: I5a5221d2e4c9eeeaeb8f5ace8275921a9aa08b8d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1742367Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Xi Han <hanxi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#685318}