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diff --git a/third_party/libwebrtc/api/turn_customizer.h b/third_party/libwebrtc/api/turn_customizer.h
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+++ b/third_party/libwebrtc/api/turn_customizer.h
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+/*
+ *  Copyright 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 API_TURN_CUSTOMIZER_H_
+#define API_TURN_CUSTOMIZER_H_
+
+#include <stdlib.h>
+
+#include "api/transport/stun.h"
+
+namespace cricket {
+class PortInterface;
+}  // namespace cricket
+
+namespace webrtc {
+
+class TurnCustomizer {
+ public:
+  // This is called before a TURN message is sent.
+  // This could be used to add implementation specific attributes to a request.
+  virtual void MaybeModifyOutgoingStunMessage(
+      cricket::PortInterface* port,
+      cricket::StunMessage* message) = 0;
+
+  // TURN can send data using channel data messages or Send indication.
+  // This method should return false if `data` should be sent using
+  // a Send indication instead of a ChannelData message, even if a
+  // channel is bound.
+  virtual bool AllowChannelData(cricket::PortInterface* port,
+                                const void* data,
+                                size_t size,
+                                bool payload) = 0;
+
+  virtual ~TurnCustomizer() {}
+};
+
+}  // namespace webrtc
+
+#endif  // API_TURN_CUSTOMIZER_H_