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diff --git a/third_party/libwebrtc/call/rtp_transport_controller_send_factory_interface.h b/third_party/libwebrtc/call/rtp_transport_controller_send_factory_interface.h
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index 0000000000..0f4c36c221
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+++ b/third_party/libwebrtc/call/rtp_transport_controller_send_factory_interface.h
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+/*
+ *  Copyright (c) 2021 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 CALL_RTP_TRANSPORT_CONTROLLER_SEND_FACTORY_INTERFACE_H_
+#define CALL_RTP_TRANSPORT_CONTROLLER_SEND_FACTORY_INTERFACE_H_
+
+#include <memory>
+
+#include "call/rtp_transport_config.h"
+#include "call/rtp_transport_controller_send_interface.h"
+
+namespace webrtc {
+// A factory used for dependency injection on the send side of the transport
+// controller.
+class RtpTransportControllerSendFactoryInterface {
+ public:
+  virtual std::unique_ptr<RtpTransportControllerSendInterface> Create(
+      const RtpTransportConfig& config,
+      Clock* clock) = 0;
+
+  virtual ~RtpTransportControllerSendFactoryInterface() {}
+};
+}  // namespace webrtc
+#endif  // CALL_RTP_TRANSPORT_CONTROLLER_SEND_FACTORY_INTERFACE_H_