DO NOT MERGE - improve audio effect framwework thread safety am: bc7f347ff5 am: 068881e79c am: 35912764e9 am: d9e0deef93  -s ours am: 7bb8e04c67 am: 851361eda0
am: 43d30448c2

Change-Id: I541038e514c69b885050dcb2b1260f1454674550