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diff --git a/third_party/libwebrtc/api/voip/voip_engine_factory.h b/third_party/libwebrtc/api/voip/voip_engine_factory.h
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+/*
+ *  Copyright (c) 2020 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_VOIP_VOIP_ENGINE_FACTORY_H_
+#define API_VOIP_VOIP_ENGINE_FACTORY_H_
+
+#include <memory>
+
+#include "api/audio_codecs/audio_decoder_factory.h"
+#include "api/audio_codecs/audio_encoder_factory.h"
+#include "api/scoped_refptr.h"
+#include "api/task_queue/task_queue_factory.h"
+#include "api/voip/voip_engine.h"
+#include "modules/audio_device/include/audio_device.h"
+#include "modules/audio_processing/include/audio_processing.h"
+
+namespace webrtc {
+
+// VoipEngineConfig is a struct that defines parameters to instantiate a
+// VoipEngine instance through CreateVoipEngine factory method. Each member is
+// marked with comments as either mandatory or optional and default
+// implementations that applications can use.
+struct VoipEngineConfig {
+  // Mandatory (e.g. api/audio_codec/builtin_audio_encoder_factory).
+  // AudioEncoderFactory provides a set of audio codecs for VoipEngine to encode
+  // the audio input sample. Application can choose to limit the set to reduce
+  // application footprint.
+  rtc::scoped_refptr<AudioEncoderFactory> encoder_factory;
+
+  // Mandatory (e.g. api/audio_codec/builtin_audio_decoder_factory).
+  // AudioDecoderFactory provides a set of audio codecs for VoipEngine to decode
+  // the received RTP packets from remote media endpoint. Application can choose
+  // to limit the set to reduce application footprint.
+  rtc::scoped_refptr<AudioDecoderFactory> decoder_factory;
+
+  // Mandatory (e.g. api/task_queue/default_task_queue_factory).
+  // TaskQeueuFactory provided for VoipEngine to work asynchronously on its
+  // encoding flow.
+  std::unique_ptr<TaskQueueFactory> task_queue_factory;
+
+  // Mandatory (e.g. modules/audio_device/include).
+  // AudioDeviceModule that periocally provides audio input samples from
+  // recording device (e.g. microphone) and requests audio output samples to
+  // play through its output device (e.g. speaker).
+  rtc::scoped_refptr<AudioDeviceModule> audio_device_module;
+
+  // Optional (e.g. modules/audio_processing/include).
+  // AudioProcessing provides audio procesing functionalities (e.g. acoustic
+  // echo cancellation, noise suppression, gain control, etc) on audio input
+  // samples for VoipEngine. When optionally not set, VoipEngine will not have
+  // such functionalities to perform on audio input samples received from
+  // AudioDeviceModule.
+  rtc::scoped_refptr<AudioProcessing> audio_processing;
+};
+
+// Creates a VoipEngine instance with provided VoipEngineConfig.
+std::unique_ptr<VoipEngine> CreateVoipEngine(VoipEngineConfig config);
+
+}  // namespace webrtc
+
+#endif  // API_VOIP_VOIP_ENGINE_FACTORY_H_