Merge AEC changes.

R=bjornv@webrtc.org
BUG=

Review URL: https://webrtc-codereview.appspot.com/34459004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@7877 4adac7df-926f-26a2-2b94-8c16560cd09d
3 files changed