DO NOT MERGE - improve audio effect framwework thread safety am: 7da83aadf4 am: 5717bb1acb  -s ours am: 199484a558 am: fff4a6aff9 am: c8fbf1a97c am: 8e24a55a3c  -s ours am: 76f5a383ea am: 6e300c3a99
am: 99b29882e4

Change-Id: Id8772818b52cbdd23e65f98c1e8ce3a26bede443