DO NOT MERGE SoundPool: add lock for findSample access from SoundPoolThread am: 3d6a714980 am: 208bc477d9  -s ours am: c56555962b
am: f4dfde92ea  -s ours

* commit 'f4dfde92ea86c333fa04a2dc54e85791208b1ca4':
  DO NOT MERGE SoundPool: add lock for findSample access from SoundPoolThread