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diff --git a/third_party/libwebrtc/modules/audio_device/test_audio_device_impl.h b/third_party/libwebrtc/modules/audio_device/test_audio_device_impl.h
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+/*
+ *  Copyright (c) 2023 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_TEST_AUDIO_DEVICE_IMPL_H_
+#define MODULES_AUDIO_DEVICE_TEST_AUDIO_DEVICE_IMPL_H_
+
+#include <memory>
+#include <vector>
+
+#include "api/task_queue/task_queue_factory.h"
+#include "modules/audio_device/audio_device_buffer.h"
+#include "modules/audio_device/audio_device_generic.h"
+#include "modules/audio_device/include/audio_device.h"
+#include "modules/audio_device/include/audio_device_defines.h"
+#include "modules/audio_device/include/test_audio_device.h"
+#include "rtc_base/buffer.h"
+#include "rtc_base/synchronization/mutex.h"
+#include "rtc_base/task_queue.h"
+
+namespace webrtc {
+
+class TestAudioDevice : public AudioDeviceGeneric {
+ public:
+  // Creates a new TestAudioDevice. When capturing or playing, 10 ms audio
+  // frames will be processed every 10ms / `speed`.
+  // `capturer` is an object that produces audio data. Can be nullptr if this
+  // device is never used for recording.
+  // `renderer` is an object that receives audio data that would have been
+  // played out. Can be nullptr if this device is never used for playing.
+  TestAudioDevice(TaskQueueFactory* task_queue_factory,
+                  std::unique_ptr<TestAudioDeviceModule::Capturer> capturer,
+                  std::unique_ptr<TestAudioDeviceModule::Renderer> renderer,
+                  float speed = 1);
+  TestAudioDevice(const TestAudioDevice&) = delete;
+  TestAudioDevice& operator=(const TestAudioDevice&) = delete;
+  ~TestAudioDevice() override = default;
+
+  // Retrieve the currently utilized audio layer
+  int32_t ActiveAudioLayer(
+      AudioDeviceModule::AudioLayer& audioLayer) const override {
+    return 0;
+  }
+
+  // Main initializaton and termination
+  InitStatus Init() override;
+  int32_t Terminate() override { return 0; }
+  bool Initialized() const override { return true; }
+
+  // Device enumeration
+  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;
+  }
+
+  // Device selection
+  int32_t SetPlayoutDevice(uint16_t index) override { return 0; }
+  int32_t SetPlayoutDevice(
+      AudioDeviceModule::WindowsDeviceType device) override {
+    return 0;
+  }
+  int32_t SetRecordingDevice(uint16_t index) override { return 0; }
+  int32_t SetRecordingDevice(
+      AudioDeviceModule::WindowsDeviceType device) override {
+    return 0;
+  }
+
+  // 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 { return 0; }
+  bool SpeakerIsInitialized() const override { return true; }
+  int32_t InitMicrophone() override { return 0; }
+  bool MicrophoneIsInitialized() const override { return true; }
+
+  // Speaker volume controls
+  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; }
+
+  // Microphone volume controls
+  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; }
+
+  // Speaker mute control
+  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; }
+
+  // Microphone mute control
+  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; }
+
+  // Stereo support
+  int32_t StereoPlayoutIsAvailable(bool& available) override {
+    available = false;
+    return 0;
+  }
+  int32_t SetStereoPlayout(bool enable) override { return 0; }
+  int32_t StereoPlayout(bool& enabled) const override { return 0; }
+  int32_t StereoRecordingIsAvailable(bool& available) override {
+    available = false;
+    return 0;
+  }
+  int32_t SetStereoRecording(bool enable) override { return 0; }
+  int32_t StereoRecording(bool& enabled) const override { return 0; }
+
+  // Delay information and control
+  int32_t PlayoutDelay(uint16_t& delayMS) const override {
+    delayMS = 0;
+    return 0;
+  }
+
+  // Android only
+  bool BuiltInAECIsAvailable() const override { return false; }
+  bool BuiltInAGCIsAvailable() const override { return false; }
+  bool BuiltInNSIsAvailable() const override { return false; }
+
+  // Windows Core Audio and Android only.
+  int32_t EnableBuiltInAEC(bool enable) override { return -1; }
+  int32_t EnableBuiltInAGC(bool enable) override { return -1; }
+  int32_t EnableBuiltInNS(bool enable) override { return -1; }
+
+  // Play underrun count.
+  int32_t GetPlayoutUnderrunCount() const override { return -1; }
+
+// iOS only.
+// TODO(henrika): add Android support.
+#if defined(WEBRTC_IOS)
+  int GetPlayoutAudioParameters(AudioParameters* params) const override {
+    return -1;
+  }
+  int GetRecordAudioParameters(AudioParameters* params) const override {
+    return -1;
+  }
+#endif  // WEBRTC_IOS
+
+  void AttachAudioBuffer(AudioDeviceBuffer* audio_buffer) override;
+
+ private:
+  void ProcessAudio();
+
+  TaskQueueFactory* const task_queue_factory_;
+  const std::unique_ptr<TestAudioDeviceModule::Capturer> capturer_
+      RTC_GUARDED_BY(lock_);
+  const std::unique_ptr<TestAudioDeviceModule::Renderer> renderer_
+      RTC_GUARDED_BY(lock_);
+  const int64_t process_interval_us_;
+
+  mutable Mutex lock_;
+  AudioDeviceBuffer* audio_buffer_ RTC_GUARDED_BY(lock_) = nullptr;
+  bool rendering_ RTC_GUARDED_BY(lock_) = false;
+  bool capturing_ RTC_GUARDED_BY(lock_) = false;
+  bool rendering_initialized_ RTC_GUARDED_BY(lock_) = false;
+  bool capturing_initialized_ RTC_GUARDED_BY(lock_) = false;
+
+  std::vector<int16_t> playout_buffer_ RTC_GUARDED_BY(lock_);
+  rtc::BufferT<int16_t> recording_buffer_ RTC_GUARDED_BY(lock_);
+  std::unique_ptr<rtc::TaskQueue> task_queue_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_DEVICE_TEST_AUDIO_DEVICE_IMPL_H_