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diff --git a/third_party/libwebrtc/media/engine/webrtc_media_engine.h b/third_party/libwebrtc/media/engine/webrtc_media_engine.h
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+++ b/third_party/libwebrtc/media/engine/webrtc_media_engine.h
@@ -0,0 +1,89 @@
+/*
+ *  Copyright (c) 2011 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 MEDIA_ENGINE_WEBRTC_MEDIA_ENGINE_H_
+#define MEDIA_ENGINE_WEBRTC_MEDIA_ENGINE_H_
+
+#include <memory>
+#include <vector>
+
+#include "absl/strings/string_view.h"
+#include "api/array_view.h"
+#include "api/audio/audio_frame_processor.h"
+#include "api/audio/audio_mixer.h"
+#include "api/audio_codecs/audio_decoder_factory.h"
+#include "api/audio_codecs/audio_encoder_factory.h"
+#include "api/field_trials_view.h"
+#include "api/rtp_parameters.h"
+#include "api/scoped_refptr.h"
+#include "api/task_queue/task_queue_factory.h"
+#include "api/transport/bitrate_settings.h"
+#include "api/video_codecs/video_decoder_factory.h"
+#include "api/video_codecs/video_encoder_factory.h"
+#include "media/base/codec.h"
+#include "media/base/media_engine.h"
+#include "modules/audio_device/include/audio_device.h"
+#include "modules/audio_processing/include/audio_processing.h"
+#include "rtc_base/system/rtc_export.h"
+
+namespace cricket {
+
+struct MediaEngineDependencies {
+  MediaEngineDependencies() = default;
+  MediaEngineDependencies(const MediaEngineDependencies&) = delete;
+  MediaEngineDependencies(MediaEngineDependencies&&) = default;
+  MediaEngineDependencies& operator=(const MediaEngineDependencies&) = delete;
+  MediaEngineDependencies& operator=(MediaEngineDependencies&&) = default;
+  ~MediaEngineDependencies() = default;
+
+  webrtc::TaskQueueFactory* task_queue_factory = nullptr;
+  rtc::scoped_refptr<webrtc::AudioDeviceModule> adm;
+  rtc::scoped_refptr<webrtc::AudioEncoderFactory> audio_encoder_factory;
+  rtc::scoped_refptr<webrtc::AudioDecoderFactory> audio_decoder_factory;
+  rtc::scoped_refptr<webrtc::AudioMixer> audio_mixer;
+  rtc::scoped_refptr<webrtc::AudioProcessing> audio_processing;
+  // TODO(bugs.webrtc.org/15111):
+  //   Remove the raw AudioFrameProcessor pointer in the follow-up.
+  webrtc::AudioFrameProcessor* audio_frame_processor = nullptr;
+  std::unique_ptr<webrtc::AudioFrameProcessor> owned_audio_frame_processor;
+
+  std::unique_ptr<webrtc::VideoEncoderFactory> video_encoder_factory;
+  std::unique_ptr<webrtc::VideoDecoderFactory> video_decoder_factory;
+
+  const webrtc::FieldTrialsView* trials = nullptr;
+};
+
+// CreateMediaEngine may be called on any thread, though the engine is
+// only expected to be used on one thread, internally called the "worker
+// thread". This is the thread Init must be called on.
+RTC_EXPORT std::unique_ptr<MediaEngineInterface> CreateMediaEngine(
+    MediaEngineDependencies dependencies);
+
+// Verify that extension IDs are within 1-byte extension range and are not
+// overlapping, and that they form a legal change from previously registerd
+// extensions (if any).
+bool ValidateRtpExtensions(
+    rtc::ArrayView<const webrtc::RtpExtension> extennsions,
+    rtc::ArrayView<const webrtc::RtpExtension> old_extensions);
+
+// Discard any extensions not validated by the 'supported' predicate. Duplicate
+// extensions are removed if 'filter_redundant_extensions' is set, and also any
+// mutually exclusive extensions (see implementation for details) are removed.
+std::vector<webrtc::RtpExtension> FilterRtpExtensions(
+    const std::vector<webrtc::RtpExtension>& extensions,
+    bool (*supported)(absl::string_view),
+    bool filter_redundant_extensions,
+    const webrtc::FieldTrialsView& trials);
+
+webrtc::BitrateConstraints GetBitrateConfigForCodec(const Codec& codec);
+
+}  // namespace cricket
+
+#endif  // MEDIA_ENGINE_WEBRTC_MEDIA_ENGINE_H_