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diff --git a/third_party/libwebrtc/modules/audio_device/win/audio_device_module_win.h b/third_party/libwebrtc/modules/audio_device/win/audio_device_module_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_AUDIO_DEVICE_MODULE_WIN_H_
+#define MODULES_AUDIO_DEVICE_WIN_AUDIO_DEVICE_MODULE_WIN_H_
+
+#include <memory>
+#include <string>
+
+#include "api/scoped_refptr.h"
+#include "api/task_queue/task_queue_factory.h"
+#include "modules/audio_device/include/audio_device.h"
+
+namespace webrtc {
+
+class AudioDeviceBuffer;
+
+namespace webrtc_win {
+
+// This interface represents the main input-related parts of the complete
+// AudioDeviceModule interface.
+class AudioInput {
+ public:
+  virtual ~AudioInput() {}
+
+  virtual int Init() = 0;
+  virtual int Terminate() = 0;
+  virtual int NumDevices() const = 0;
+  virtual int SetDevice(int index) = 0;
+  virtual int SetDevice(AudioDeviceModule::WindowsDeviceType device) = 0;
+  virtual int DeviceName(int index, std::string* name, std::string* guid) = 0;
+  virtual void AttachAudioBuffer(AudioDeviceBuffer* audio_buffer) = 0;
+  virtual bool RecordingIsInitialized() const = 0;
+  virtual int InitRecording() = 0;
+  virtual int StartRecording() = 0;
+  virtual int StopRecording() = 0;
+  virtual bool Recording() = 0;
+  virtual int VolumeIsAvailable(bool* available) = 0;
+  virtual int RestartRecording() = 0;
+  virtual bool Restarting() const = 0;
+  virtual int SetSampleRate(uint32_t sample_rate) = 0;
+};
+
+// This interface represents the main output-related parts of the complete
+// AudioDeviceModule interface.
+class AudioOutput {
+ public:
+  virtual ~AudioOutput() {}
+
+  virtual int Init() = 0;
+  virtual int Terminate() = 0;
+  virtual int NumDevices() const = 0;
+  virtual int SetDevice(int index) = 0;
+  virtual int SetDevice(AudioDeviceModule::WindowsDeviceType device) = 0;
+  virtual int DeviceName(int index, std::string* name, std::string* guid) = 0;
+  virtual void AttachAudioBuffer(AudioDeviceBuffer* audio_buffer) = 0;
+  virtual bool PlayoutIsInitialized() const = 0;
+  virtual int InitPlayout() = 0;
+  virtual int StartPlayout() = 0;
+  virtual int StopPlayout() = 0;
+  virtual bool Playing() = 0;
+  virtual int VolumeIsAvailable(bool* available) = 0;
+  virtual int RestartPlayout() = 0;
+  virtual bool Restarting() const = 0;
+  virtual int SetSampleRate(uint32_t sample_rate) = 0;
+};
+
+// Combines an AudioInput and an AudioOutput implementation to build an
+// AudioDeviceModule. Hides most parts of the full ADM interface.
+rtc::scoped_refptr<AudioDeviceModuleForTest>
+CreateWindowsCoreAudioAudioDeviceModuleFromInputAndOutput(
+    std::unique_ptr<AudioInput> audio_input,
+    std::unique_ptr<AudioOutput> audio_output,
+    TaskQueueFactory* task_queue_factory);
+
+}  // namespace webrtc_win
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_DEVICE_WIN_AUDIO_DEVICE_MODULE_WIN_H_