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Previously, memory metrics were collected at fixed intervals. The new timing
uses a poisson process to emit the same number of events, but at randomly chosen
times.

Bug: 895474
Change-Id: I3e9564372e7b0c71f58965e6b238efe1c1de2ae9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1836005
Auto-Submit: Erik Chen <erikchen@chromium.org>
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702993}