How to get TestResults.qpa

BUG=angleproject:1607, angleproject:1690

Change-Id: Id1ea934fe4917baf4f9ba47d5d0b5d415077241e
Reviewed-on: https://chromium-review.googlesource.com/445962
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>