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This improves the WebRTC audio processing module adaptation on mono signals even when being played out on more than one speaker.

Tested: made appr.tc calls with all combinations of mono/stereo audio, multi-channel feature flag on/off, APM in audio service enabled/disabled: verified that (locally modified) log statement for entering multi-channel is printed, verified that aecdump recordings have the right content, verified that not too much processing happens before stereo is detected

Bug: chromium:1016708, chromium:1023337
Change-Id: Ia6827f26e01dba6779ab356687f7920ce9fa8703
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1906210Reviewed-by: Olga Sharonova <olka@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Sam Zackrisson <saza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715252}