Make heap profiler tests more robust

Bug: 965356
Change-Id: Ib959f34d94a1ffa580725e015554d462d8b2c1b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1620637
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661735}
5 files changed