Enables mixing and matching Java and native audio. It is used for getting best of both worlds capabilities (AEC and low latency). BUG=N/A R=fischman@webrtc.org, niklas.enbom@webrtc.org Review URL: https://webrtc-codereview.appspot.com/4189004 git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5270 4adac7df-926f-26a2-2b94-8c16560cd09d