[automerger skipped] Merge "Allow getCapturePosition to return 0 frames for unprepared streams" into pie-vts-dev am: 137194ef5e  -s ours am: 7fd4c19ee7  -s ours
am: fd9aa9d8f9  -s ours

Change-Id: Ie142d7e2e14215b51bdbd1bb145bb9cdf26a1543