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diff --git a/third_party/libwebrtc/common_audio/ring_buffer.h b/third_party/libwebrtc/common_audio/ring_buffer.h
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+++ b/third_party/libwebrtc/common_audio/ring_buffer.h
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+/*
+ *  Copyright (c) 2011 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.
+ */
+
+// A ring buffer to hold arbitrary data. Provides no thread safety. Unless
+// otherwise specified, functions return 0 on success and -1 on error.
+
+#ifndef COMMON_AUDIO_RING_BUFFER_H_
+#define COMMON_AUDIO_RING_BUFFER_H_
+
+// TODO(alessiob): Used by AEC, AECm and AudioRingBuffer. Remove when possible.
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stddef.h>  // size_t
+
+enum Wrap { SAME_WRAP, DIFF_WRAP };
+
+typedef struct RingBuffer {
+  size_t read_pos;
+  size_t write_pos;
+  size_t element_count;
+  size_t element_size;
+  enum Wrap rw_wrap;
+  char* data;
+} RingBuffer;
+
+// Creates and initializes the buffer. Returns null on failure.
+RingBuffer* WebRtc_CreateBuffer(size_t element_count, size_t element_size);
+void WebRtc_InitBuffer(RingBuffer* handle);
+void WebRtc_FreeBuffer(void* handle);
+
+// Reads data from the buffer. Returns the number of elements that were read.
+// The `data_ptr` will point to the address where the read data is located.
+// If no data can be read, `data_ptr` is set to `NULL`. If all data can be read
+// without buffer wrap around then `data_ptr` will point to the location in the
+// buffer. Otherwise, the data will be copied to `data` (memory allocation done
+// by the user) and `data_ptr` points to the address of `data`. `data_ptr` is
+// only guaranteed to be valid until the next call to WebRtc_WriteBuffer().
+//
+// To force a copying to `data`, pass a null `data_ptr`.
+//
+// Returns number of elements read.
+size_t WebRtc_ReadBuffer(RingBuffer* handle,
+                         void** data_ptr,
+                         void* data,
+                         size_t element_count);
+
+// Writes `data` to buffer and returns the number of elements written.
+size_t WebRtc_WriteBuffer(RingBuffer* handle,
+                          const void* data,
+                          size_t element_count);
+
+// Moves the buffer read position and returns the number of elements moved.
+// Positive `element_count` moves the read position towards the write position,
+// that is, flushing the buffer. Negative `element_count` moves the read
+// position away from the the write position, that is, stuffing the buffer.
+// Returns number of elements moved.
+int WebRtc_MoveReadPtr(RingBuffer* handle, int element_count);
+
+// Returns number of available elements to read.
+size_t WebRtc_available_read(const RingBuffer* handle);
+
+// Returns number of available elements for write.
+size_t WebRtc_available_write(const RingBuffer* handle);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // COMMON_AUDIO_RING_BUFFER_H_