Added basic framework for AEC3 in the audio processing module

webrtc/modules/audio_processing/echo_cancellation_impl.h

 /*
  *  Copyright (c) 2012 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 26 matching lines @@
   SuppressionLevel suppression_level() const override;
   bool is_drift_compensation_enabled() const override;
 
   void Initialize(int sample_rate_hz,
                   size_t num_reverse_channels_,
                   size_t num_output_channels_,
                   size_t num_proc_channels_);
   void SetExtraOptions(const webrtc::Config& config);
   bool is_delay_agnostic_enabled() const;
   bool is_extended_filter_enabled() const;
-  bool is_aec3_enabled() const;
   std::string GetExperimentsDescription();
   bool is_refined_adaptive_filter_enabled() const;
 
   // Returns the system delay of the first AEC component.
   int GetSystemDelayInSamples() const;
 
   static void PackRenderAudioBuffer(const AudioBuffer* audio,
                                     size_t num_output_channels,
                                     size_t num_channels,
                                     std::vector<float>* packed_buffer);
@@ skipping 39 matching lines @@
   bool enabled_ = false;
   bool drift_compensation_enabled_ GUARDED_BY(crit_capture_);
   bool metrics_enabled_ GUARDED_BY(crit_capture_);
   SuppressionLevel suppression_level_ GUARDED_BY(crit_capture_);
   int stream_drift_samples_ GUARDED_BY(crit_capture_);
   bool was_stream_drift_set_ GUARDED_BY(crit_capture_);
   bool stream_has_echo_ GUARDED_BY(crit_capture_);
   bool delay_logging_enabled_ GUARDED_BY(crit_capture_);
   bool extended_filter_enabled_ GUARDED_BY(crit_capture_);
   bool delay_agnostic_enabled_ GUARDED_BY(crit_capture_);
-  bool aec3_enabled_ GUARDED_BY(crit_capture_);
   bool refined_adaptive_filter_enabled_ GUARDED_BY(crit_capture_) = false;
 
   std::vector<std::unique_ptr<Canceller>> cancellers_;
   std::unique_ptr<StreamProperties> stream_properties_;
 
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(EchoCancellationImpl);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_ECHO_CANCELLATION_IMPL_H_