Add an optional artificial nearend signal for aecdump call recreation

webrtc/modules/audio_processing/test/audio_processing_simulator.h

Index: webrtc/modules/audio_processing/test/audio_processing_simulator.h
diff --git a/webrtc/modules/audio_processing/test/audio_processing_simulator.h b/webrtc/modules/audio_processing/test/audio_processing_simulator.h
index 7becdb9a6bcb6b64453a1aa41cb4299658879a2b..13a189f493093abeb1dba76a33a236c147ea7f1f 100644
--- a/webrtc/modules/audio_processing/test/audio_processing_simulator.h
+++ b/webrtc/modules/audio_processing/test/audio_processing_simulator.h
@@ -44,6 +44,7 @@ struct SimulationSettings {
   rtc::Optional<std::string> reverse_output_filename;
   rtc::Optional<std::string> input_filename;
   rtc::Optional<std::string> reverse_input_filename;
+  rtc::Optional<std::string> artificial_nearend_filename;
   rtc::Optional<bool> use_aec;
   rtc::Optional<bool> use_aecm;
   rtc::Optional<bool> use_ed;  // Residual Echo Detector.
@@ -149,6 +150,7 @@ class AudioProcessingSimulator {
   std::unique_ptr<AudioProcessing> ap_;
 
   std::unique_ptr<ChannelBuffer<float>> in_buf_;
+  std::unique_ptr<ChannelBuffer<float>> artificial_nearend_buf_;
   std::unique_ptr<ChannelBuffer<float>> out_buf_;
   std::unique_ptr<ChannelBuffer<float>> reverse_in_buf_;
   std::unique_ptr<ChannelBuffer<float>> reverse_out_buf_;
@@ -157,6 +159,7 @@ class AudioProcessingSimulator {
   StreamConfig reverse_in_config_;
   StreamConfig reverse_out_config_;
   std::unique_ptr<ChannelBufferWavReader> buffer_reader_;
+  std::unique_ptr<ChannelBufferWavReader> artificial_nearend_buffer_reader_;
   std::unique_ptr<ChannelBufferWavReader> reverse_buffer_reader_;
   AudioFrame rev_frame_;
   AudioFrame fwd_frame_;