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

Change-Id: Ifd7b54c76d870eb8c94587015982166453b69300