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Previously, there was two sets of mostly identical logic to start a trace,
ensure that heap dumps are collected, and then report the results.

Bug: 753218
Change-Id: I8dba3c94256a8da9e9364b49bd86275db14a9df3
Reviewed-on: https://chromium-review.googlesource.com/777554
Commit-Queue: Erik Chen <erikchen@chromium.org>
Reviewed-by: Brett Wilson <brettw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519927}