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

Change-Id: I84f3371cf4ac96e94b7f321b25fe51cf5e0cf4af