API to control target delay in NetEq jitter buffer. NetEq maintains the given delay unless channel conditions require a higher delay.

TEST=unit-test, manual, trybots.
R=henrik.lundin@webrtc.org, henrika@webrtc.org, mflodman@webrtc.org, mikhal@webrtc.org, stefan@webrtc.org, tina.legrand@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1384005

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@4087 4adac7df-926f-26a2-2b94-8c16560cd09d
19 files changed