Fix AudioTrack offloaded timestamp handling.

getTimestamp for offloaded tracks now returns WOULD_BLOCK for
situations where the timestamp is unavailable due to the
previous track still flushing or the timestamp is stale.
It is fixed for normal playback conditions.

Bug: 14659809
Bug: 17428188
Change-Id: Ic9ec07ccabc604236979769db5c4ea2dec252660
2 files changed