Add clock to ACM config struct

The purpose is to clean up the ACM interface a bit. This is a
follow-up of a comment in http://review.webrtc.org/13379004/.

R=turaj@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/16389005

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@6006 4adac7df-926f-26a2-2b94-8c16560cd09d
7 files changed