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This is a reland of 37bc2e24

*** SHERIFFS: if there is any failing memory leak tests, please file bug & disable them in https://cs.chromium.org/chromium/src/tools/perf/expectations.config?q=tools/perf/expectations.config instead of reverting this CL ***

Original change's description:
> Reland introduce sharding to memory.leak_detection
>
> This CL fixes a bug in test_suites.pyl and introduces sharding to memory.leak_detection benchmark.
> Original CL: https://chromium-review.googlesource.com/c/chromium/src/+/1180788
> TBR=nednguyen@chromium.org,dpranke@chromium.org
>
> Cq-Include-Trybots: master.tryserver.chromium.perf:obbs_fyi
> Change-Id: Ie1a3be0b3b47a9feb57d77a779a6df8cf8257a3c
> Reviewed-on: https://chromium-review.googlesource.com/1182714
> Reviewed-by: Yuzu Saijo <yuzus@chromium.org>
> Commit-Queue: Yuzu Saijo <yuzus@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#584644}

Change-Id: Ib54d75d47e39835a17d00834d468642d8b6bac2a
Cq-Include-Trybots: master.tryserver.chromium.perf:obbs_fyi

TBR=yuzus@chromium.org, dpranke@chromium.org
NOTRY=true # reland

Change-Id: Ib54d75d47e39835a17d00834d468642d8b6bac2a
Reviewed-on: https://chromium-review.googlesource.com/1183241
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#584711}