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diff --git a/third_party/libwebrtc/test/pc/e2e/echo/echo_emulation.h b/third_party/libwebrtc/test/pc/e2e/echo/echo_emulation.h
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+++ b/third_party/libwebrtc/test/pc/e2e/echo/echo_emulation.h
@@ -0,0 +1,79 @@
+/*
+ *  Copyright (c) 2019 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 TEST_PC_E2E_ECHO_ECHO_EMULATION_H_
+#define TEST_PC_E2E_ECHO_ECHO_EMULATION_H_
+
+#include <atomic>
+#include <deque>
+#include <memory>
+#include <vector>
+
+#include "api/test/pclf/media_configuration.h"
+#include "modules/audio_device/include/test_audio_device.h"
+#include "rtc_base/swap_queue.h"
+
+namespace webrtc {
+namespace webrtc_pc_e2e {
+
+// Reduces audio input strength from provided capturer twice and adds input
+// provided into EchoEmulatingCapturer::OnAudioRendered(...).
+class EchoEmulatingCapturer : public TestAudioDeviceModule::Capturer {
+ public:
+  EchoEmulatingCapturer(
+      std::unique_ptr<TestAudioDeviceModule::Capturer> capturer,
+      EchoEmulationConfig config);
+
+  void OnAudioRendered(rtc::ArrayView<const int16_t> data);
+
+  int SamplingFrequency() const override {
+    return delegate_->SamplingFrequency();
+  }
+  int NumChannels() const override { return delegate_->NumChannels(); }
+  bool Capture(rtc::BufferT<int16_t>* buffer) override;
+
+ private:
+  std::unique_ptr<TestAudioDeviceModule::Capturer> delegate_;
+  const EchoEmulationConfig config_;
+
+  SwapQueue<std::vector<int16_t>> renderer_queue_;
+
+  SequenceChecker renderer_thread_;
+  std::vector<int16_t> queue_input_ RTC_GUARDED_BY(renderer_thread_);
+  bool recording_started_ RTC_GUARDED_BY(renderer_thread_) = false;
+
+  SequenceChecker capturer_thread_;
+  std::vector<int16_t> queue_output_ RTC_GUARDED_BY(capturer_thread_);
+  bool delay_accumulated_ RTC_GUARDED_BY(capturer_thread_) = false;
+};
+
+// Renders output into provided renderer and also copy output into provided
+// EchoEmulationCapturer.
+class EchoEmulatingRenderer : public TestAudioDeviceModule::Renderer {
+ public:
+  EchoEmulatingRenderer(
+      std::unique_ptr<TestAudioDeviceModule::Renderer> renderer,
+      EchoEmulatingCapturer* echo_emulating_capturer);
+
+  int SamplingFrequency() const override {
+    return delegate_->SamplingFrequency();
+  }
+  int NumChannels() const override { return delegate_->NumChannels(); }
+  bool Render(rtc::ArrayView<const int16_t> data) override;
+
+ private:
+  std::unique_ptr<TestAudioDeviceModule::Renderer> delegate_;
+  EchoEmulatingCapturer* echo_emulating_capturer_;
+};
+
+}  // namespace webrtc_pc_e2e
+}  // namespace webrtc
+
+#endif  // TEST_PC_E2E_ECHO_ECHO_EMULATION_H_