Delay Estimator: Converts a constant into a configurable parameter.

The parameter is used in the robust validation scheme, which will be turned on in a separate CL.

* Setter and getter for allowed delay offset.
* Updated unittests.

BUG=None
TESTED=modules_unittests, trybots
R=aluebs@webrtc.org, andrew@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/6669004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5351 4adac7df-926f-26a2-2b94-8c16560cd09d
5 files changed