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 am: b132ba6071 am: 482341fa20 am: c8ab1a8da5
am: a3ea3450ee  -s ours

Change-Id: Ia5d06affc2286b78bb7ef2bb1c3182776aa7ef7a