This CL changes the AEC3 behavior to be more transparent when there is uncertainty about the amount of echo in the microphone signal. Bug: webrtc:8398, chromium:774868 Change-Id: I88e681f8decd892f44397b753df371a1c4b90af0 Reviewed-on: https://webrtc-review.googlesource.com/10801 Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org> Commit-Queue: Per Åhgren <peah@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20319}