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diff --git a/third_party/libwebrtc/modules/audio_processing/aec3/subtractor_output_analyzer.h b/third_party/libwebrtc/modules/audio_processing/aec3/subtractor_output_analyzer.h
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+++ b/third_party/libwebrtc/modules/audio_processing/aec3/subtractor_output_analyzer.h
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+/*
+ *  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_PROCESSING_AEC3_SUBTRACTOR_OUTPUT_ANALYZER_H_
+#define MODULES_AUDIO_PROCESSING_AEC3_SUBTRACTOR_OUTPUT_ANALYZER_H_
+
+#include <vector>
+
+#include "modules/audio_processing/aec3/subtractor_output.h"
+
+namespace webrtc {
+
+// Class for analyzing the properties subtractor output.
+class SubtractorOutputAnalyzer {
+ public:
+  explicit SubtractorOutputAnalyzer(size_t num_capture_channels);
+  ~SubtractorOutputAnalyzer() = default;
+
+  // Analyses the subtractor output.
+  void Update(rtc::ArrayView<const SubtractorOutput> subtractor_output,
+              bool* any_filter_converged,
+              bool* any_coarse_filter_converged,
+              bool* all_filters_diverged);
+
+  const std::vector<bool>& ConvergedFilters() const {
+    return filters_converged_;
+  }
+
+  // Handle echo path change.
+  void HandleEchoPathChange();
+
+ private:
+  std::vector<bool> filters_converged_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_AEC3_SUBTRACTOR_OUTPUT_ANALYZER_H_