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diff --git a/src/system_wrappers/interface/sort.h b/src/system_wrappers/interface/sort.h
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+++ b/src/system_wrappers/interface/sort.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.
+ */
+
+// Generic unstable sorting routines.
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_SORT_H_
+#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_SORT_H_
+
+#include "typedefs.h"
+#include "common_types.h"
+
+namespace webrtc
+{
+    enum Type
+    {
+        TYPE_Word8,
+        TYPE_UWord8,
+        TYPE_Word16,
+        TYPE_UWord16,
+        TYPE_Word32,
+        TYPE_UWord32,
+        TYPE_Word64,
+        TYPE_UWord64,
+        TYPE_Float32,
+        TYPE_Float64
+    };
+    // Sorts intrinsic data types.
+    //
+    // data          [in/out] A pointer to an array of intrinsic type.
+    //               Upon return it will be sorted in ascending order.
+    // numOfElements The number of elements in the array.
+    // dataType      Enum corresponding to the type of the array.
+    //
+    // returns 0 on success, -1 on failure.
+    WebRtc_Word32 Sort(void* data, WebRtc_UWord32 numOfElements, Type dataType);
+
+    // Sorts arbitrary data types. This requires an array of intrinsically typed
+    // key values which will be used to sort the data array. There must be a
+    // one-to-one correspondence between data elements and key elements, with
+    // corresponding elements sharing the same position in their respective
+    // arrays.
+    //
+    // data          [in/out] A pointer to an array of arbitrary type.
+    //               Upon return it will be sorted in ascending order.
+    // key           [in] A pointer to an array of keys used to sort the
+    //               data array.
+    // numOfElements The number of elements in the arrays.
+    // sizeOfElement The size, in bytes, of the data array.
+    // keyType       Enum corresponding to the type of the key array.
+    //
+    // returns 0 on success, -1 on failure.
+    //
+    WebRtc_Word32 KeySort(void* data, void* key, WebRtc_UWord32 numOfElements,
+                          WebRtc_UWord32 sizeOfElement, Type keyType);
+}
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_SORT_H_