Add an optional artificial nearend signal for aecdump call recreation

webrtc/modules/audio_processing/test/aec_dump_based_simulator.h

Index: webrtc/modules/audio_processing/test/aec_dump_based_simulator.h
diff --git a/webrtc/modules/audio_processing/test/aec_dump_based_simulator.h b/webrtc/modules/audio_processing/test/aec_dump_based_simulator.h
index 7f98f43b66d1e7b233c24d79117b6d63093b643e..5f7d138aa41eff5b2bf5a3f9374ba99836939fb5 100644
--- a/webrtc/modules/audio_processing/test/aec_dump_based_simulator.h
+++ b/webrtc/modules/audio_processing/test/aec_dump_based_simulator.h
@@ -30,9 +30,8 @@ namespace test {
 // Used to perform an audio processing simulation from an aec dump.
 class AecDumpBasedSimulator final : public AudioProcessingSimulator {
  public:
-  explicit AecDumpBasedSimulator(const SimulationSettings& settings)
-      : AudioProcessingSimulator(settings) {}
-  ~AecDumpBasedSimulator() override {}
+  explicit AecDumpBasedSimulator(const SimulationSettings& settings);
+  ~AecDumpBasedSimulator() override;
 
   // Processes the messages in the aecdump file.
   void Process() override;
@@ -55,6 +54,9 @@ class AecDumpBasedSimulator final : public AudioProcessingSimulator {
   };
 
   FILE* dump_input_file_;
+  std::unique_ptr<ChannelBuffer<float>> artificial_nearend_buf_;
+  std::unique_ptr<ChannelBufferWavReader> artificial_nearend_buffer_reader_;
+  bool artificial_nearend_eof_reported_ = false;
   InterfaceType interface_used_ = InterfaceType::kNotSpecified;
 
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(AecDumpBasedSimulator);