DO NOT MERGE - improve audio effect framwework thread safety am: 84c392104e  -s ours am: 5d5f9cd28a am: 10f61954ba  -s ours am: bb4c9408ec am: 642e5857fe am: b763905a4f am: eef8dc0294  -s ours am: 7454e9d217 am: 5acee4ff97 am: e5de51e57c am: 2c543a3106 am: 675565b0d9
am: 6b4a8425d1  -s ours

Change-Id: I6c11cc2da012edc7ac6dd298adb77bc8f0bc47c2