chromeos: get SingleProcessMash working

BUG=847992
TEST=covered by tests

Change-Id: I94ea9b06426f100520c019759c2d10e477fbede3
Reviewed-on: https://chromium-review.googlesource.com/1173354
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582921}
14 files changed