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

Change-Id: I14f1399192ca95dc061cae572455eedfc01fcefe