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The result of a memory measurement now:
- includes an empty breakdown entry.
- has random order of breakdown entryies.

Bug: chromium:1085129
Change-Id: Ie3f338d8274a0276d09f732560ed9797f5c376af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2607339
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Nicolás Peña Moreno <npm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841002}