DO NOT MERGE - improve audio effect framwework thread safety am: b47a5ab107 am: 26cf2f4d73 am: 73a152960b  -s ours am: 21d6eafd26  -s ours am: 6c5deab4f2 am: 9685820100  -s ours am: 6608eddab9
am: c6a7a42379

Change-Id: I675bfc4d6c17c718f2411f415bf8e18d6601ab0a