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 am: d1b6293802 am: 1771044fd4  -s ours am: 9ddb80f888
am: 58a605ff7d

Change-Id: Ic6d7dbb0a039fae7eb9785cc4747120cba635bae