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
am: eea5d5d23a

Change-Id: Ib7f35b02ecbfb637b254e0b4af89a3f36d99d6af