Major updates to the echo removal functionality in AEC3

webrtc/modules/audio_processing/aec3/echo_remover_metrics.cc

 /*
  *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 204 matching lines @@
             "WebRTC.Audio.EchoCanceller.SuppressorGainBand1.Min",
             aec3::TransformDbMetricForReporting(
                 true, 0.f, 59.f, 0.f, 1.f, suppressor_gain_[1].floor_value),
             0, 59, 30);
         break;
       case kMetricsCollectionBlocks + 9:
         RTC_HISTOGRAM_BOOLEAN(
             "WebRTC.Audio.EchoCanceller.UsableLinearEstimate",
             static_cast<int>(aec_state.UsableLinearEstimate() ? 1 : 0));
         RTC_HISTOGRAM_BOOLEAN(
-            "WebRTC.Audio.EchoCanceller.ModelBasedAecFeasible",
-            static_cast<int>(aec_state.ModelBasedAecFeasible() ? 1 : 0));
-        RTC_HISTOGRAM_BOOLEAN(
             "WebRTC.Audio.EchoCanceller.ActiveRender",
             static_cast<int>(
                 active_render_count_ > kMetricsCollectionBlocksBy2 ? 1 : 0));
         RTC_HISTOGRAM_COUNTS_LINEAR(
             "WebRTC.Audio.EchoCanceller.FilterDelay",
             aec_state.FilterDelay() ? *aec_state.FilterDelay() + 1 : 0, 0, 30,
             31);
         RTC_HISTOGRAM_BOOLEAN("WebRTC.Audio.EchoCanceller.CaptureSaturation",
                               static_cast<int>(saturated_capture_ ? 1 : 0));
         metrics_reported_ = true;
@@ skipping 37 matching lines @@
   float new_value = 10.f * log10(value * scaling + 1e-10f) + offset;
   if (negate) {
     new_value = -new_value;
   }
   return static_cast<int>(std::max(min_value, std::min(max_value, new_value)));
 }
 
 }  // namespace aec3
 
 }  // namespace webrtc