Previously we assumed that `surfaceSyncGroupV34` was always non-null on
API 34, but this isn't true in edit mode. Instead we add an explicit
null-check before accessing it. We don't need to null-check it at the
other usage site because we are already null-checking `surfaceView` (via
`instanceof` check).
Issue: androidx/media#1237
#cherrypick
PiperOrigin-RevId: 645008049
99803066ea