Add adaptive notch filter to remove narrowband echo components in AEC3

webrtc/modules/audio_processing/aec3/echo_remover.cc

Index: webrtc/modules/audio_processing/aec3/echo_remover.cc
diff --git a/webrtc/modules/audio_processing/aec3/echo_remover.cc b/webrtc/modules/audio_processing/aec3/echo_remover.cc
index 842c3854e50f1a1a0ee279be4f332326b5926ff7..09d71da88865653a03b1af96999b1c56ad948f62 100644
--- a/webrtc/modules/audio_processing/aec3/echo_remover.cc
+++ b/webrtc/modules/audio_processing/aec3/echo_remover.cc
@@ -186,8 +186,9 @@ void EchoRemoverImpl::ProcessCapture(
 
   // A choose and apply echo suppression gain.
   suppression_gain_.GetGain(E2, R2, cng_.NoiseSpectrum(),
-                            aec_state_.SaturatedEcho(), x,
-                            aec_state_.ForcedZeroGain(), &high_bands_gain, &G);
+                            render_signal_analyzer_, aec_state_.SaturatedEcho(),
+                            x, aec_state_.ForcedZeroGain(), &high_bands_gain,
+                            &G);
   suppression_filter_.ApplyGain(comfort_noise, high_band_comfort_noise, G,
                                 high_bands_gain, y);
 
@@ -195,6 +196,8 @@ void EchoRemoverImpl::ProcessCapture(
   metrics_.Update(aec_state_, cng_.NoiseSpectrum(), G);
 
   // Debug outputs for the purpose of development and analysis.
+  data_dumper_->DumpRaw("aec3_narrow_render",
+                        render_signal_analyzer_.NarrowPeakBand() ? 1 : 0);
   data_dumper_->DumpRaw("aec3_N2", cng_.NoiseSpectrum());
   data_dumper_->DumpRaw("aec3_suppressor_gain", G);
   data_dumper_->DumpWav("aec3_output",