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 am: 8ba19b881d
am: 10b7776913  -s ours

Change-Id: I6b5e4c2f60c68c6652a83a9220f9873f0933b5c5