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We have identified that the reason of not getting throughput UKM is
due to the sampling logic, via this debug CL:
https://chromium-review.googlesource.com/c/chromium/src/+/1946872

This CL changes the sampling logic.

Bug: 1029964
Change-Id: Icf5fc750102d0e3631047913d77adb4e37589721
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1958195Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Stephen Chenney <schenney@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723642}