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diff --git a/third_party/libwebrtc/modules/audio_processing/aec3/suppression_filter.h b/third_party/libwebrtc/modules/audio_processing/aec3/suppression_filter.h
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+++ b/third_party/libwebrtc/modules/audio_processing/aec3/suppression_filter.h
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+/*
+ *  Copyright (c) 2017 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_SUPPRESSION_FILTER_H_
+#define MODULES_AUDIO_PROCESSING_AEC3_SUPPRESSION_FILTER_H_
+
+#include <array>
+#include <vector>
+
+#include "modules/audio_processing/aec3/aec3_common.h"
+#include "modules/audio_processing/aec3/aec3_fft.h"
+#include "modules/audio_processing/aec3/block.h"
+#include "modules/audio_processing/aec3/fft_data.h"
+
+namespace webrtc {
+
+class SuppressionFilter {
+ public:
+  SuppressionFilter(Aec3Optimization optimization,
+                    int sample_rate_hz,
+                    size_t num_capture_channels_);
+  ~SuppressionFilter();
+
+  SuppressionFilter(const SuppressionFilter&) = delete;
+  SuppressionFilter& operator=(const SuppressionFilter&) = delete;
+
+  void ApplyGain(rtc::ArrayView<const FftData> comfort_noise,
+                 rtc::ArrayView<const FftData> comfort_noise_high_bands,
+                 const std::array<float, kFftLengthBy2Plus1>& suppression_gain,
+                 float high_bands_gain,
+                 rtc::ArrayView<const FftData> E_lowest_band,
+                 Block* e);
+
+ private:
+  const Aec3Optimization optimization_;
+  const int sample_rate_hz_;
+  const size_t num_capture_channels_;
+  const Aec3Fft fft_;
+  std::vector<std::vector<std::array<float, kFftLengthBy2>>> e_output_old_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_AEC3_SUPPRESSION_FILTER_H_