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diff --git a/third_party/libwebrtc/modules/audio_processing/test/wav_based_simulator.h b/third_party/libwebrtc/modules/audio_processing/test/wav_based_simulator.h
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+/*
+ *  Copyright (c) 2016 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.
+ */
+
+#ifndef MODULES_AUDIO_PROCESSING_TEST_WAV_BASED_SIMULATOR_H_
+#define MODULES_AUDIO_PROCESSING_TEST_WAV_BASED_SIMULATOR_H_
+
+#include <vector>
+
+#include "absl/strings/string_view.h"
+#include "modules/audio_processing/test/audio_processing_simulator.h"
+
+namespace webrtc {
+namespace test {
+
+// Used to perform an audio processing simulation from wav files.
+class WavBasedSimulator final : public AudioProcessingSimulator {
+ public:
+  WavBasedSimulator(const SimulationSettings& settings,
+                    rtc::scoped_refptr<AudioProcessing> audio_processing,
+                    std::unique_ptr<AudioProcessingBuilder> ap_builder);
+
+  WavBasedSimulator() = delete;
+  WavBasedSimulator(const WavBasedSimulator&) = delete;
+  WavBasedSimulator& operator=(const WavBasedSimulator&) = delete;
+
+  ~WavBasedSimulator() override;
+
+  // Processes the WAV input.
+  void Process() override;
+
+  // Only analyzes the data for the simulation, instead of perform any
+  // processing.
+  void Analyze() override;
+
+ private:
+  enum SimulationEventType {
+    kProcessStream,
+    kProcessReverseStream,
+  };
+
+  void Initialize();
+  bool HandleProcessStreamCall();
+  bool HandleProcessReverseStreamCall();
+  void PrepareProcessStreamCall();
+  void PrepareReverseProcessStreamCall();
+  static std::vector<SimulationEventType> GetDefaultEventChain();
+  static std::vector<SimulationEventType> GetCustomEventChain(
+      absl::string_view filename);
+
+  std::vector<SimulationEventType> call_chain_;
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_TEST_WAV_BASED_SIMULATOR_H_