[autotest] Teach suite_scheduler how to parse depthcharge builds.

It's pgo-release all over again...  I really do need to sit down and
write a better fix to this one day.

BUG=chromium:218079
TEST=unit

Change-Id: I95729a40dc68c547523dcfa1acf7b7ad6e960366
Reviewed-on: https://gerrit.chromium.org/gerrit/45758
Tested-by: Alex Miller <milleral@chromium.org>
Commit-Queue: Alex Miller <milleral@chromium.org>
Reviewed-by: Scott Zawalski <scottz@chromium.org>
3 files changed