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diff --git a/third_party/libwebrtc/api/test/neteq_simulator_factory.h b/third_party/libwebrtc/api/test/neteq_simulator_factory.h
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+/*
+ *  Copyright (c) 2018 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 API_TEST_NETEQ_SIMULATOR_FACTORY_H_
+#define API_TEST_NETEQ_SIMULATOR_FACTORY_H_
+
+#include <memory>
+#include <string>
+
+#include "absl/strings/string_view.h"
+#include "absl/types/optional.h"
+#include "api/neteq/neteq_factory.h"
+#include "api/test/neteq_simulator.h"
+
+namespace webrtc {
+namespace test {
+
+class NetEqTestFactory;
+
+class NetEqSimulatorFactory {
+ public:
+  NetEqSimulatorFactory();
+  ~NetEqSimulatorFactory();
+  struct Config {
+    // The maximum allowed number of packets in the jitter buffer.
+    int max_nr_packets_in_buffer = 0;
+    // The number of audio packets to insert at the start of the simulation.
+    // Since the simulation is done with a replacement audio file, these
+    // artificial packets will take a small piece of that replacement audio.
+    int initial_dummy_packets = 0;
+    // The number of simulation steps to skip at the start of the simulation.
+    // This removes incoming packets and GetAudio events from the start of the
+    // simulation, until the requested number of GetAudio events has been
+    // removed.
+    int skip_get_audio_events = 0;
+    // A WebRTC field trial string to be used during the simulation.
+    std::string field_trial_string;
+    // A filename for the generated output audio file.
+    absl::optional<std::string> output_audio_filename;
+    // A filename for the python plot.
+    absl::optional<std::string> python_plot_filename;
+    // A filename for the text log.
+    absl::optional<std::string> text_log_filename;
+    // A custom NetEqFactory can be used.
+    NetEqFactory* neteq_factory = nullptr;
+  };
+  std::unique_ptr<NetEqSimulator> CreateSimulatorFromFile(
+      absl::string_view event_log_filename,
+      absl::string_view replacement_audio_filename,
+      Config simulation_config);
+  // The same as above, but pass the file contents as a string.
+  std::unique_ptr<NetEqSimulator> CreateSimulatorFromString(
+      absl::string_view event_log_file_contents,
+      absl::string_view replacement_audio_file,
+      Config simulation_config);
+
+ private:
+  std::unique_ptr<NetEqTestFactory> factory_;
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // API_TEST_NETEQ_SIMULATOR_FACTORY_H_