This CL introduces a channel remapping for the mono input case that is more tailored to the VoIP usecase. The CL contains a kill-switch that can be used to fall back to the old mapping behavior in case a need for this is perceived. Bug: chromium:1027117 Change-Id: Idaaba6eac952e6436beaaf5a1a697cfab8f63286 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/160280 Commit-Queue: Per Åhgren <peah@webrtc.org> Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org> Reviewed-by: Sam Zackrisson <saza@webrtc.org> Cr-Commit-Position: refs/heads/master@{#29877}