This is a merge request for
https://webrtc-review.googlesource.com/q/I51ad279af156aba1b5cc75ae203334a34bce9d48

This change reduces how quickly the jitter estimator reacts to large
frames, which can happen especially with screenshare and sudden content
changes.

In extreme cases a few errant frames could previously cause several
seconds of delay to be added to the render buffer on the receive side.

The change can be considered low risk, especially since it also includes
a field trial flag so we can tweak how outliers are capped by this
change.

The change has been in Canary since 72.0.3599.0 which was released on
November 1st. Everything looking good so far.