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To correctly implement poisson process sampling, we occasionally have to take
multiple samples from a single allocation. Since the memlog stream format does
not support a "count" or "weight" parameter, use "sz" as a proxy.

Bug: 810748
Change-Id: Ie87be75b0915afd5d032943f8a42cb5a190ce6e5
Reviewed-on: https://chromium-review.googlesource.com/922982Reviewed-by: Primiano Tucci <primiano@chromium.org>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537361}