Add tests for webRTC AEC

Closed Flore Harlé requested to merge feature/AEC-tests into master

Add methods to MSWebRTC AEC filter to enable the update of delay and to get the current median of the estimated delay. The estimation of the delay is used by the tests suite "AEC" of mediastreamer2.

mediastreamer2!1010 (closed)

linphone-sdk!4579 (closed)

See also https://linphone.atlassian.net/browse/SDK-268

Edited by Flore Harlé

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