Hook up audio/video sync to Call.

Adds an end-to-end audio/video sync test.

BUG=2530, 2608
TEST=trybots
R=henrika@webrtc.org, mflodman@webrtc.org, pbos@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/3699004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5128 4adac7df-926f-26a2-2b94-8c16560cd09d
15 files changed