[automerger skipped] Merge "Allow getCapturePosition to return 0 frames for unprepared streams" into pie-vts-dev am: 137194ef5e am: 30c2361ad4  -s ours am: a29aa05595  -s ours
am: 9eaa2f33da  -s ours

Change-Id: Ie8af7ef7efc1325daf3e84589da48b7839921b10