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diff --git a/third_party/libwebrtc/modules/audio_device/audio_device_impl.h b/third_party/libwebrtc/modules/audio_device/audio_device_impl.h
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+++ b/third_party/libwebrtc/modules/audio_device/audio_device_impl.h
@@ -0,0 +1,180 @@
+/*
+ *  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 MODULES_AUDIO_DEVICE_AUDIO_DEVICE_IMPL_H_
+#define MODULES_AUDIO_DEVICE_AUDIO_DEVICE_IMPL_H_
+
+#if defined(WEBRTC_INCLUDE_INTERNAL_AUDIO_DEVICE)
+
+#include <stdint.h>
+
+#include <memory>
+
+#include "api/task_queue/task_queue_factory.h"
+#include "modules/audio_device/audio_device_buffer.h"
+#include "modules/audio_device/include/audio_device.h"
+
+namespace webrtc {
+
+class AudioDeviceGeneric;
+class AudioManager;
+
+class AudioDeviceModuleImpl : public AudioDeviceModuleForTest {
+ public:
+  enum PlatformType {
+    kPlatformNotSupported = 0,
+    kPlatformWin32 = 1,
+    kPlatformWinCe = 2,
+    kPlatformLinux = 3,
+    kPlatformMac = 4,
+    kPlatformAndroid = 5,
+    kPlatformIOS = 6
+  };
+
+  int32_t CheckPlatform();
+  int32_t CreatePlatformSpecificObjects();
+  int32_t AttachAudioBuffer();
+
+  AudioDeviceModuleImpl(AudioLayer audio_layer,
+                        TaskQueueFactory* task_queue_factory);
+  ~AudioDeviceModuleImpl() override;
+
+  // Retrieve the currently utilized audio layer
+  int32_t ActiveAudioLayer(AudioLayer* audioLayer) const override;
+
+  // Full-duplex transportation of PCM audio
+  int32_t RegisterAudioCallback(AudioTransport* audioCallback) override;
+
+  // Main initializaton and termination
+  int32_t Init() override;
+  int32_t Terminate() override;
+  bool Initialized() const override;
+
+  // Device enumeration
+  int16_t PlayoutDevices() override;
+  int16_t RecordingDevices() override;
+  int32_t PlayoutDeviceName(uint16_t index,
+                            char name[kAdmMaxDeviceNameSize],
+                            char guid[kAdmMaxGuidSize]) override;
+  int32_t RecordingDeviceName(uint16_t index,
+                              char name[kAdmMaxDeviceNameSize],
+                              char guid[kAdmMaxGuidSize]) override;
+
+  // Device selection
+  int32_t SetPlayoutDevice(uint16_t index) override;
+  int32_t SetPlayoutDevice(WindowsDeviceType device) override;
+  int32_t SetRecordingDevice(uint16_t index) override;
+  int32_t SetRecordingDevice(WindowsDeviceType device) override;
+
+  // Audio transport initialization
+  int32_t PlayoutIsAvailable(bool* available) override;
+  int32_t InitPlayout() override;
+  bool PlayoutIsInitialized() const override;
+  int32_t RecordingIsAvailable(bool* available) override;
+  int32_t InitRecording() override;
+  bool RecordingIsInitialized() const override;
+
+  // Audio transport control
+  int32_t StartPlayout() override;
+  int32_t StopPlayout() override;
+  bool Playing() const override;
+  int32_t StartRecording() override;
+  int32_t StopRecording() override;
+  bool Recording() const override;
+
+  // Audio mixer initialization
+  int32_t InitSpeaker() override;
+  bool SpeakerIsInitialized() const override;
+  int32_t InitMicrophone() override;
+  bool MicrophoneIsInitialized() const override;
+
+  // Speaker volume controls
+  int32_t SpeakerVolumeIsAvailable(bool* available) override;
+  int32_t SetSpeakerVolume(uint32_t volume) override;
+  int32_t SpeakerVolume(uint32_t* volume) const override;
+  int32_t MaxSpeakerVolume(uint32_t* maxVolume) const override;
+  int32_t MinSpeakerVolume(uint32_t* minVolume) const override;
+
+  // Microphone volume controls
+  int32_t MicrophoneVolumeIsAvailable(bool* available) override;
+  int32_t SetMicrophoneVolume(uint32_t volume) override;
+  int32_t MicrophoneVolume(uint32_t* volume) const override;
+  int32_t MaxMicrophoneVolume(uint32_t* maxVolume) const override;
+  int32_t MinMicrophoneVolume(uint32_t* minVolume) const override;
+
+  // Speaker mute control
+  int32_t SpeakerMuteIsAvailable(bool* available) override;
+  int32_t SetSpeakerMute(bool enable) override;
+  int32_t SpeakerMute(bool* enabled) const override;
+
+  // Microphone mute control
+  int32_t MicrophoneMuteIsAvailable(bool* available) override;
+  int32_t SetMicrophoneMute(bool enable) override;
+  int32_t MicrophoneMute(bool* enabled) const override;
+
+  // Stereo support
+  int32_t StereoPlayoutIsAvailable(bool* available) const override;
+  int32_t SetStereoPlayout(bool enable) override;
+  int32_t StereoPlayout(bool* enabled) const override;
+  int32_t StereoRecordingIsAvailable(bool* available) const override;
+  int32_t SetStereoRecording(bool enable) override;
+  int32_t StereoRecording(bool* enabled) const override;
+
+  // Delay information and control
+  int32_t PlayoutDelay(uint16_t* delayMS) const override;
+
+  bool BuiltInAECIsAvailable() const override;
+  int32_t EnableBuiltInAEC(bool enable) override;
+  bool BuiltInAGCIsAvailable() const override;
+  int32_t EnableBuiltInAGC(bool enable) override;
+  bool BuiltInNSIsAvailable() const override;
+  int32_t EnableBuiltInNS(bool enable) override;
+
+  // Play underrun count.
+  int32_t GetPlayoutUnderrunCount() const override;
+
+#if defined(WEBRTC_IOS)
+  int GetPlayoutAudioParameters(AudioParameters* params) const override;
+  int GetRecordAudioParameters(AudioParameters* params) const override;
+#endif  // WEBRTC_IOS
+
+#if defined(WEBRTC_ANDROID)
+  // Only use this acccessor for test purposes on Android.
+  AudioManager* GetAndroidAudioManagerForTest() {
+    return audio_manager_android_.get();
+  }
+#endif
+  AudioDeviceBuffer* GetAudioDeviceBuffer() { return &audio_device_buffer_; }
+
+  int RestartPlayoutInternally() override { return -1; }
+  int RestartRecordingInternally() override { return -1; }
+  int SetPlayoutSampleRate(uint32_t sample_rate) override { return -1; }
+  int SetRecordingSampleRate(uint32_t sample_rate) override { return -1; }
+
+ private:
+  PlatformType Platform() const;
+  AudioLayer PlatformAudioLayer() const;
+
+  AudioLayer audio_layer_;
+  PlatformType platform_type_ = kPlatformNotSupported;
+  bool initialized_ = false;
+#if defined(WEBRTC_ANDROID)
+  // Should be declared first to ensure that it outlives other resources.
+  std::unique_ptr<AudioManager> audio_manager_android_;
+#endif
+  AudioDeviceBuffer audio_device_buffer_;
+  std::unique_ptr<AudioDeviceGeneric> audio_device_;
+};
+
+}  // namespace webrtc
+
+#endif  // defined(WEBRTC_INCLUDE_INTERNAL_AUDIO_DEVICE)
+
+#endif  // MODULES_AUDIO_DEVICE_AUDIO_DEVICE_IMPL_H_