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Specifically Memory.Renderer.PrivateMemoryFootprint. This refactors existing
code in hopes of sharing names and some portions of the logic. This doesn't
include Memory.Browser as it's not really under our control (I'm starting an
email thread on this one). Logging is only enabled for the non-single process
case.

This patch is exactly the same as the first patch. I fixed the reason that
lead to the revert here: https://chromium-review.googlesource.com/c/chromium/src/+/1716584

BUG=981102
TEST=covered by integration tests
TBR=bcwhite@chromium.org, changwan@chromium.org, chrisha@chromium.org

Change-Id: Iabb1193481600c208fe56207aaef01d1fd3b9401
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1726410Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Reviewed-by: Changwan Ryu <changwan@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682416}