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diff --git a/third_party/libwebrtc/modules/audio_device/include/audio_device_default.h b/third_party/libwebrtc/modules/audio_device/include/audio_device_default.h
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index 0000000000..3779d6fb3b
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+++ b/third_party/libwebrtc/modules/audio_device/include/audio_device_default.h
@@ -0,0 +1,132 @@
+/*
+ *  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_INCLUDE_AUDIO_DEVICE_DEFAULT_H_
+#define MODULES_AUDIO_DEVICE_INCLUDE_AUDIO_DEVICE_DEFAULT_H_
+
+#include "modules/audio_device/include/audio_device.h"
+
+namespace webrtc {
+namespace webrtc_impl {
+
+// AudioDeviceModuleDefault template adds default implementation for all
+// AudioDeviceModule methods to the class, which inherits from
+// AudioDeviceModuleDefault<T>.
+template <typename T>
+class AudioDeviceModuleDefault : public T {
+ public:
+  AudioDeviceModuleDefault() {}
+  virtual ~AudioDeviceModuleDefault() {}
+
+  int32_t RegisterAudioCallback(AudioTransport* audioCallback) override {
+    return 0;
+  }
+  int32_t Init() override { return 0; }
+  int32_t InitSpeaker() override { return 0; }
+  int32_t SetPlayoutDevice(uint16_t index) override { return 0; }
+  int32_t SetPlayoutDevice(
+      AudioDeviceModule::WindowsDeviceType device) override {
+    return 0;
+  }
+  int32_t SetStereoPlayout(bool enable) override { return 0; }
+  int32_t StopPlayout() override { return 0; }
+  int32_t InitMicrophone() override { return 0; }
+  int32_t SetRecordingDevice(uint16_t index) override { return 0; }
+  int32_t SetRecordingDevice(
+      AudioDeviceModule::WindowsDeviceType device) override {
+    return 0;
+  }
+  int32_t SetStereoRecording(bool enable) override { return 0; }
+  int32_t StopRecording() override { return 0; }
+
+  int32_t Terminate() override { return 0; }
+
+  int32_t ActiveAudioLayer(
+      AudioDeviceModule::AudioLayer* audioLayer) const override {
+    return 0;
+  }
+  bool Initialized() const override { return true; }
+  int16_t PlayoutDevices() override { return 0; }
+  int16_t RecordingDevices() override { return 0; }
+  int32_t PlayoutDeviceName(uint16_t index,
+                            char name[kAdmMaxDeviceNameSize],
+                            char guid[kAdmMaxGuidSize]) override {
+    return 0;
+  }
+  int32_t RecordingDeviceName(uint16_t index,
+                              char name[kAdmMaxDeviceNameSize],
+                              char guid[kAdmMaxGuidSize]) override {
+    return 0;
+  }
+  int32_t PlayoutIsAvailable(bool* available) override { return 0; }
+  int32_t InitPlayout() override { return 0; }
+  bool PlayoutIsInitialized() const override { return true; }
+  int32_t RecordingIsAvailable(bool* available) override { return 0; }
+  int32_t InitRecording() override { return 0; }
+  bool RecordingIsInitialized() const override { return true; }
+  int32_t StartPlayout() override { return 0; }
+  bool Playing() const override { return false; }
+  int32_t StartRecording() override { return 0; }
+  bool Recording() const override { return false; }
+  bool SpeakerIsInitialized() const override { return true; }
+  bool MicrophoneIsInitialized() const override { return true; }
+  int32_t SpeakerVolumeIsAvailable(bool* available) override { return 0; }
+  int32_t SetSpeakerVolume(uint32_t volume) override { return 0; }
+  int32_t SpeakerVolume(uint32_t* volume) const override { return 0; }
+  int32_t MaxSpeakerVolume(uint32_t* maxVolume) const override { return 0; }
+  int32_t MinSpeakerVolume(uint32_t* minVolume) const override { return 0; }
+  int32_t MicrophoneVolumeIsAvailable(bool* available) override { return 0; }
+  int32_t SetMicrophoneVolume(uint32_t volume) override { return 0; }
+  int32_t MicrophoneVolume(uint32_t* volume) const override { return 0; }
+  int32_t MaxMicrophoneVolume(uint32_t* maxVolume) const override { return 0; }
+  int32_t MinMicrophoneVolume(uint32_t* minVolume) const override { return 0; }
+  int32_t SpeakerMuteIsAvailable(bool* available) override { return 0; }
+  int32_t SetSpeakerMute(bool enable) override { return 0; }
+  int32_t SpeakerMute(bool* enabled) const override { return 0; }
+  int32_t MicrophoneMuteIsAvailable(bool* available) override { return 0; }
+  int32_t SetMicrophoneMute(bool enable) override { return 0; }
+  int32_t MicrophoneMute(bool* enabled) const override { return 0; }
+  int32_t StereoPlayoutIsAvailable(bool* available) const override {
+    *available = false;
+    return 0;
+  }
+  int32_t StereoPlayout(bool* enabled) const override { return 0; }
+  int32_t StereoRecordingIsAvailable(bool* available) const override {
+    *available = false;
+    return 0;
+  }
+  int32_t StereoRecording(bool* enabled) const override { return 0; }
+  int32_t PlayoutDelay(uint16_t* delayMS) const override {
+    *delayMS = 0;
+    return 0;
+  }
+  bool BuiltInAECIsAvailable() const override { return false; }
+  int32_t EnableBuiltInAEC(bool enable) override { return -1; }
+  bool BuiltInAGCIsAvailable() const override { return false; }
+  int32_t EnableBuiltInAGC(bool enable) override { return -1; }
+  bool BuiltInNSIsAvailable() const override { return false; }
+  int32_t EnableBuiltInNS(bool enable) override { return -1; }
+
+  int32_t GetPlayoutUnderrunCount() const override { return -1; }
+
+#if defined(WEBRTC_IOS)
+  int GetPlayoutAudioParameters(AudioParameters* params) const override {
+    return -1;
+  }
+  int GetRecordAudioParameters(AudioParameters* params) const override {
+    return -1;
+  }
+#endif  // WEBRTC_IOS
+};
+
+}  // namespace webrtc_impl
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_DEVICE_INCLUDE_AUDIO_DEVICE_DEFAULT_H_