This CL defines SpectralFeaturesExtractor which is responsible for computing the spectral features used as input for the RNN. Bug: webrtc:9076 Change-Id: I5e1396b89eca9c13bb268e8419a16436a9c3450f Reviewed-on: https://webrtc-review.googlesource.com/73760 Commit-Queue: Alessio Bazzica <alessiob@webrtc.org> Reviewed-by: Alex Loiko <aleloi@webrtc.org> Reviewed-by: Ivo Creusen <ivoc@webrtc.org> Cr-Commit-Position: refs/heads/master@{#23206}