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diff --git a/third_party/libwebrtc/modules/audio_device/win/core_audio_output_win.h b/third_party/libwebrtc/modules/audio_device/win/core_audio_output_win.h
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+++ b/third_party/libwebrtc/modules/audio_device/win/core_audio_output_win.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 MODULES_AUDIO_DEVICE_WIN_CORE_AUDIO_OUTPUT_WIN_H_
+#define MODULES_AUDIO_DEVICE_WIN_CORE_AUDIO_OUTPUT_WIN_H_
+
+#include <memory>
+#include <string>
+
+#include "modules/audio_device/win/audio_device_module_win.h"
+#include "modules/audio_device/win/core_audio_base_win.h"
+
+namespace webrtc {
+
+class AudioDeviceBuffer;
+class FineAudioBuffer;
+
+namespace webrtc_win {
+
+// Windows specific AudioOutput implementation using a CoreAudioBase class where
+// an output direction is set at construction. Supports render device handling
+// and streaming of decoded audio from a WebRTC client to the native audio
+// layer.
+class CoreAudioOutput final : public CoreAudioBase, public AudioOutput {
+ public:
+  CoreAudioOutput(bool automatic_restart);
+  ~CoreAudioOutput() override;
+
+  // AudioOutput implementation.
+  int Init() override;
+  int Terminate() override;
+  int NumDevices() const override;
+  int SetDevice(int index) override;
+  int SetDevice(AudioDeviceModule::WindowsDeviceType device) override;
+  int DeviceName(int index, std::string* name, std::string* guid) override;
+  void AttachAudioBuffer(AudioDeviceBuffer* audio_buffer) override;
+  bool PlayoutIsInitialized() const override;
+  int InitPlayout() override;
+  int StartPlayout() override;
+  int StopPlayout() override;
+  bool Playing() override;
+  int VolumeIsAvailable(bool* available) override;
+  int RestartPlayout() override;
+  bool Restarting() const override;
+  int SetSampleRate(uint32_t sample_rate) override;
+
+  CoreAudioOutput(const CoreAudioOutput&) = delete;
+  CoreAudioOutput& operator=(const CoreAudioOutput&) = delete;
+
+ private:
+  void ReleaseCOMObjects();
+  bool OnDataCallback(uint64_t device_frequency);
+  bool OnErrorCallback(ErrorType error);
+  int EstimateOutputLatencyMillis(uint64_t device_frequency);
+  bool HandleStreamDisconnected();
+
+  std::unique_ptr<FineAudioBuffer> fine_audio_buffer_;
+  Microsoft::WRL::ComPtr<IAudioRenderClient> audio_render_client_;
+  uint64_t num_frames_written_ = 0;
+};
+
+}  // namespace webrtc_win
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_DEVICE_WIN_CORE_AUDIO_OUTPUT_WIN_H_