Add API to query video engine for the send-side delay.

R=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/4559005

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5225 4adac7df-926f-26a2-2b94-8c16560cd09d
12 files changed