SoundPool: handle new audio track event

If the AudioTrack is torn down, SoundPool will never
receive the buffer end event and the track will stay active
for ever.

The fix consists in stopping the AudioTrack when a new audiotrack
event is received.

Bug: 11193583.
Change-Id: I9876eb2a8f75c601368f669acd67b0accf6e2736
1 file changed