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diff --git a/third_party/libwebrtc/modules/audio_processing/test/audio_processing_builder_for_testing.h b/third_party/libwebrtc/modules/audio_processing/test/audio_processing_builder_for_testing.h
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+/*
+ *  Copyright (c) 2020 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_PROCESSING_TEST_AUDIO_PROCESSING_BUILDER_FOR_TESTING_H_
+#define MODULES_AUDIO_PROCESSING_TEST_AUDIO_PROCESSING_BUILDER_FOR_TESTING_H_
+
+#include <list>
+#include <memory>
+#include <utility>
+#include <vector>
+
+#include "modules/audio_processing/include/audio_processing.h"
+
+namespace webrtc {
+
+// Facilitates building of AudioProcessingImp for the tests.
+class AudioProcessingBuilderForTesting {
+ public:
+  AudioProcessingBuilderForTesting();
+  AudioProcessingBuilderForTesting(const AudioProcessingBuilderForTesting&) =
+      delete;
+  AudioProcessingBuilderForTesting& operator=(
+      const AudioProcessingBuilderForTesting&) = delete;
+  ~AudioProcessingBuilderForTesting();
+
+  // Sets the APM configuration.
+  AudioProcessingBuilderForTesting& SetConfig(
+      const AudioProcessing::Config& config) {
+    config_ = config;
+    return *this;
+  }
+
+  // Sets the echo controller factory to inject when APM is created.
+  AudioProcessingBuilderForTesting& SetEchoControlFactory(
+      std::unique_ptr<EchoControlFactory> echo_control_factory) {
+    echo_control_factory_ = std::move(echo_control_factory);
+    return *this;
+  }
+
+  // Sets the capture post-processing sub-module to inject when APM is created.
+  AudioProcessingBuilderForTesting& SetCapturePostProcessing(
+      std::unique_ptr<CustomProcessing> capture_post_processing) {
+    capture_post_processing_ = std::move(capture_post_processing);
+    return *this;
+  }
+
+  // Sets the render pre-processing sub-module to inject when APM is created.
+  AudioProcessingBuilderForTesting& SetRenderPreProcessing(
+      std::unique_ptr<CustomProcessing> render_pre_processing) {
+    render_pre_processing_ = std::move(render_pre_processing);
+    return *this;
+  }
+
+  // Sets the echo detector to inject when APM is created.
+  AudioProcessingBuilderForTesting& SetEchoDetector(
+      rtc::scoped_refptr<EchoDetector> echo_detector) {
+    echo_detector_ = std::move(echo_detector);
+    return *this;
+  }
+
+  // Sets the capture analyzer sub-module to inject when APM is created.
+  AudioProcessingBuilderForTesting& SetCaptureAnalyzer(
+      std::unique_ptr<CustomAudioAnalyzer> capture_analyzer) {
+    capture_analyzer_ = std::move(capture_analyzer);
+    return *this;
+  }
+
+  // Creates an APM instance with the specified config or the default one if
+  // unspecified. Injects the specified components transferring the ownership
+  // to the newly created APM instance - i.e., except for the config, the
+  // builder is reset to its initial state.
+  rtc::scoped_refptr<AudioProcessing> Create();
+
+ private:
+  // Transfers the ownership to a non-testing builder.
+  void TransferOwnershipsToBuilder(AudioProcessingBuilder* builder);
+
+  AudioProcessing::Config config_;
+  std::unique_ptr<EchoControlFactory> echo_control_factory_;
+  std::unique_ptr<CustomProcessing> capture_post_processing_;
+  std::unique_ptr<CustomProcessing> render_pre_processing_;
+  rtc::scoped_refptr<EchoDetector> echo_detector_;
+  std::unique_ptr<CustomAudioAnalyzer> capture_analyzer_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_TEST_AUDIO_PROCESSING_BUILDER_FOR_TESTING_H_