This CL introduces an adaptive estimation of the early reverb in the estimation for the room reverberation. The benefits of this is that for room with long early reflections there is a lower risk of underestimating the reverberation. This CL is for a landing the code in https://webrtc-review.googlesource.com/c/src/+/87420, and the review of the code was done in that CL. The author of code is devicentepena@webrtc.org Bug: webrtc:9479, chromium:865397 Change-Id: Id6f57e2a684664aef96e8c502e66775f37da59da Reviewed-on: https://webrtc-review.googlesource.com/91162 Commit-Queue: Per Åhgren <peah@webrtc.org> Reviewed-by: Sam Zackrisson <saza@webrtc.org> Cr-Commit-Position: refs/heads/master@{#24146}