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diff --git a/third_party/libwebrtc/common_audio/fir_filter_factory.h b/third_party/libwebrtc/common_audio/fir_filter_factory.h
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+++ b/third_party/libwebrtc/common_audio/fir_filter_factory.h
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+/*
+ *  Copyright (c) 2014 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 COMMON_AUDIO_FIR_FILTER_FACTORY_H_
+#define COMMON_AUDIO_FIR_FILTER_FACTORY_H_
+
+#include <string.h>
+
+namespace webrtc {
+
+class FIRFilter;
+
+// Creates a filter with the given coefficients. All initial state values will
+// be zeros.
+// The length of the chunks fed to the filter should never be greater than
+// `max_input_length`. This is needed because, when vectorizing it is
+// necessary to concatenate the input after the state, and resizing this array
+// dynamically is expensive.
+FIRFilter* CreateFirFilter(const float* coefficients,
+                           size_t coefficients_length,
+                           size_t max_input_length);
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_FIR_FILTER_FACTORY_H_