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diff --git a/third_party/libwebrtc/modules/audio_device/audio_device_generic.h b/third_party/libwebrtc/modules/audio_device/audio_device_generic.h
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+++ b/third_party/libwebrtc/modules/audio_device/audio_device_generic.h
@@ -0,0 +1,145 @@
+/*
+ *  Copyright (c) 2012 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 AUDIO_DEVICE_AUDIO_DEVICE_GENERIC_H_
+#define AUDIO_DEVICE_AUDIO_DEVICE_GENERIC_H_
+
+#include <stdint.h>
+
+#include "modules/audio_device/audio_device_buffer.h"
+#include "modules/audio_device/include/audio_device.h"
+#include "modules/audio_device/include/audio_device_defines.h"
+
+namespace webrtc {
+
+class AudioDeviceGeneric {
+ public:
+  // For use with UMA logging. Must be kept in sync with histograms.xml in
+  // Chrome, located at
+  // https://cs.chromium.org/chromium/src/tools/metrics/histograms/histograms.xml
+  enum class InitStatus {
+    OK = 0,
+    PLAYOUT_ERROR = 1,
+    RECORDING_ERROR = 2,
+    OTHER_ERROR = 3,
+    NUM_STATUSES = 4
+  };
+  // Retrieve the currently utilized audio layer
+  virtual int32_t ActiveAudioLayer(
+      AudioDeviceModule::AudioLayer& audioLayer) const = 0;
+
+  // Main initializaton and termination
+  virtual InitStatus Init() = 0;
+  virtual int32_t Terminate() = 0;
+  virtual bool Initialized() const = 0;
+
+  // Device enumeration
+  virtual int16_t PlayoutDevices() = 0;
+  virtual int16_t RecordingDevices() = 0;
+  virtual int32_t PlayoutDeviceName(uint16_t index,
+                                    char name[kAdmMaxDeviceNameSize],
+                                    char guid[kAdmMaxGuidSize]) = 0;
+  virtual int32_t RecordingDeviceName(uint16_t index,
+                                      char name[kAdmMaxDeviceNameSize],
+                                      char guid[kAdmMaxGuidSize]) = 0;
+
+  // Device selection
+  virtual int32_t SetPlayoutDevice(uint16_t index) = 0;
+  virtual int32_t SetPlayoutDevice(
+      AudioDeviceModule::WindowsDeviceType device) = 0;
+  virtual int32_t SetRecordingDevice(uint16_t index) = 0;
+  virtual int32_t SetRecordingDevice(
+      AudioDeviceModule::WindowsDeviceType device) = 0;
+
+  // Audio transport initialization
+  virtual int32_t PlayoutIsAvailable(bool& available) = 0;
+  virtual int32_t InitPlayout() = 0;
+  virtual bool PlayoutIsInitialized() const = 0;
+  virtual int32_t RecordingIsAvailable(bool& available) = 0;
+  virtual int32_t InitRecording() = 0;
+  virtual bool RecordingIsInitialized() const = 0;
+
+  // Audio transport control
+  virtual int32_t StartPlayout() = 0;
+  virtual int32_t StopPlayout() = 0;
+  virtual bool Playing() const = 0;
+  virtual int32_t StartRecording() = 0;
+  virtual int32_t StopRecording() = 0;
+  virtual bool Recording() const = 0;
+
+  // Audio mixer initialization
+  virtual int32_t InitSpeaker() = 0;
+  virtual bool SpeakerIsInitialized() const = 0;
+  virtual int32_t InitMicrophone() = 0;
+  virtual bool MicrophoneIsInitialized() const = 0;
+
+  // Speaker volume controls
+  virtual int32_t SpeakerVolumeIsAvailable(bool& available) = 0;
+  virtual int32_t SetSpeakerVolume(uint32_t volume) = 0;
+  virtual int32_t SpeakerVolume(uint32_t& volume) const = 0;
+  virtual int32_t MaxSpeakerVolume(uint32_t& maxVolume) const = 0;
+  virtual int32_t MinSpeakerVolume(uint32_t& minVolume) const = 0;
+
+  // Microphone volume controls
+  virtual int32_t MicrophoneVolumeIsAvailable(bool& available) = 0;
+  virtual int32_t SetMicrophoneVolume(uint32_t volume) = 0;
+  virtual int32_t MicrophoneVolume(uint32_t& volume) const = 0;
+  virtual int32_t MaxMicrophoneVolume(uint32_t& maxVolume) const = 0;
+  virtual int32_t MinMicrophoneVolume(uint32_t& minVolume) const = 0;
+
+  // Speaker mute control
+  virtual int32_t SpeakerMuteIsAvailable(bool& available) = 0;
+  virtual int32_t SetSpeakerMute(bool enable) = 0;
+  virtual int32_t SpeakerMute(bool& enabled) const = 0;
+
+  // Microphone mute control
+  virtual int32_t MicrophoneMuteIsAvailable(bool& available) = 0;
+  virtual int32_t SetMicrophoneMute(bool enable) = 0;
+  virtual int32_t MicrophoneMute(bool& enabled) const = 0;
+
+  // Stereo support
+  virtual int32_t StereoPlayoutIsAvailable(bool& available) = 0;
+  virtual int32_t SetStereoPlayout(bool enable) = 0;
+  virtual int32_t StereoPlayout(bool& enabled) const = 0;
+  virtual int32_t StereoRecordingIsAvailable(bool& available) = 0;
+  virtual int32_t SetStereoRecording(bool enable) = 0;
+  virtual int32_t StereoRecording(bool& enabled) const = 0;
+
+  // Delay information and control
+  virtual int32_t PlayoutDelay(uint16_t& delayMS) const = 0;
+
+  // Android only
+  virtual bool BuiltInAECIsAvailable() const;
+  virtual bool BuiltInAGCIsAvailable() const;
+  virtual bool BuiltInNSIsAvailable() const;
+
+  // Windows Core Audio and Android only.
+  virtual int32_t EnableBuiltInAEC(bool enable);
+  virtual int32_t EnableBuiltInAGC(bool enable);
+  virtual int32_t EnableBuiltInNS(bool enable);
+
+  // Play underrun count.
+  virtual int32_t GetPlayoutUnderrunCount() const;
+
+// iOS only.
+// TODO(henrika): add Android support.
+#if defined(WEBRTC_IOS)
+  virtual int GetPlayoutAudioParameters(AudioParameters* params) const;
+  virtual int GetRecordAudioParameters(AudioParameters* params) const;
+#endif  // WEBRTC_IOS
+
+  virtual void AttachAudioBuffer(AudioDeviceBuffer* audioBuffer) = 0;
+
+  virtual ~AudioDeviceGeneric() {}
+};
+
+}  // namespace webrtc
+
+#endif  // AUDIO_DEVICE_AUDIO_DEVICE_GENERIC_H_