Added back the 'agc2 level estimation' flag. Also added a flag for moving the level measurement before AEC and NS. This is to run offline experiments with audioproc_f. Bug: webrtc:7494 Change-Id: I3e3ffceede7166b754130be2b707b620ba527e9f Reviewed-on: https://webrtc-review.googlesource.com/97442 Reviewed-by: Alessio Bazzica <alessiob@webrtc.org> Commit-Queue: Alex Loiko <aleloi@webrtc.org> Cr-Commit-Position: refs/heads/master@{#24657}