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diff --git a/third_party/libwebrtc/webrtc/media/engine/webrtcmediaengine.h b/third_party/libwebrtc/webrtc/media/engine/webrtcmediaengine.h
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+++ b/third_party/libwebrtc/webrtc/media/engine/webrtcmediaengine.h
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+/*
+ *  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_WEBRTCMEDIAENGINE_H_
+#define MEDIA_ENGINE_WEBRTCMEDIAENGINE_H_
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "call/call.h"
+#include "media/base/mediaengine.h"
+
+namespace webrtc {
+class AudioDecoderFactory;
+class AudioDeviceModule;
+class AudioMixer;
+class AudioProcessing;
+class VideoDecoderFactory;
+class VideoEncoderFactory;
+}
+namespace cricket {
+class WebRtcVideoDecoderFactory;
+class WebRtcVideoEncoderFactory;
+}
+
+namespace cricket {
+
+class WebRtcMediaEngineFactory {
+ public:
+  // These Create methods 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.
+  //
+  // TODO(deadbeef): Change these to return an std::unique_ptr<>, to indicate
+  // that the caller owns the returned object.
+  static MediaEngineInterface* Create(
+      webrtc::AudioDeviceModule* adm,
+      const rtc::scoped_refptr<webrtc::AudioEncoderFactory>&
+          audio_encoder_factory,
+      const rtc::scoped_refptr<webrtc::AudioDecoderFactory>&
+          audio_decoder_factory,
+      WebRtcVideoEncoderFactory* video_encoder_factory,
+      WebRtcVideoDecoderFactory* video_decoder_factory);
+  static MediaEngineInterface* Create(
+      webrtc::AudioDeviceModule* adm,
+      const rtc::scoped_refptr<webrtc::AudioEncoderFactory>&
+          audio_encoder_factory,
+      const rtc::scoped_refptr<webrtc::AudioDecoderFactory>&
+          audio_decoder_factory,
+      WebRtcVideoEncoderFactory* video_encoder_factory,
+      WebRtcVideoDecoderFactory* video_decoder_factory,
+      rtc::scoped_refptr<webrtc::AudioMixer> audio_mixer,
+      rtc::scoped_refptr<webrtc::AudioProcessing> apm);
+
+  // Create a MediaEngineInterface with optional video codec factories. These
+  // video factories represents all video codecs, i.e. no extra internal video
+  // codecs will be added.
+  static std::unique_ptr<MediaEngineInterface> Create(
+      rtc::scoped_refptr<webrtc::AudioDeviceModule> adm,
+      rtc::scoped_refptr<webrtc::AudioEncoderFactory> audio_encoder_factory,
+      rtc::scoped_refptr<webrtc::AudioDecoderFactory> audio_decoder_factory,
+      std::unique_ptr<webrtc::VideoEncoderFactory> video_encoder_factory,
+      std::unique_ptr<webrtc::VideoDecoderFactory> video_decoder_factory,
+      rtc::scoped_refptr<webrtc::AudioMixer> audio_mixer,
+      rtc::scoped_refptr<webrtc::AudioProcessing> audio_processing);
+};
+
+// Verify that extension IDs are within 1-byte extension range and are not
+// overlapping.
+bool ValidateRtpExtensions(const std::vector<webrtc::RtpExtension>& 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)(const std::string&),
+    bool filter_redundant_extensions);
+
+webrtc::Call::Config::BitrateConfig GetBitrateConfigForCodec(
+    const Codec& codec);
+
+}  // namespace cricket
+
+#endif  // MEDIA_ENGINE_WEBRTCMEDIAENGINE_H_