DO NOT MERGE SoundPool: add lock for findSample access from SoundPoolThread am: 0a887bcd5c am: 7c798c13a7 am: 94cefd6adb am: a30685ef8d
am: ae4b789619

* commit 'ae4b7896195727dfd8d00b90f25074206bf21775':
  DO NOT MERGE SoundPool: add lock for findSample access from SoundPoolThread