Add a PacketOptions struct to webrtc::Transport.

webrtc/transport.h

 /*
  *  Copyright (c) 2013 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 WEBRTC_VIDEO_ENGINE_NEW_INCLUDE_TRANSPORT_H_
 #define WEBRTC_VIDEO_ENGINE_NEW_INCLUDE_TRANSPORT_H_
 
 #include <stddef.h>
 
 #include "webrtc/typedefs.h"
 
 namespace webrtc {
 
+struct PacketOptions {
+  int transport_sequence_number = -1;

[pbos-webrtc, 2015/09/29 09:54:42]

Shouldn't this one be a fixed-size datatype? Or is this an uint16_t or -1 which
always fits?

[stefan-webrtc, 2015/09/29 10:00:13]

It is uint16_t or -1. We could make it int32_t instead if you'd like that
better.

+};
+
 class Transport {
  public:
-  virtual bool SendRtp(const uint8_t* packet, size_t length) = 0;
+  virtual bool SendRtp(const uint8_t* packet,
+                       size_t length,
+                       const PacketOptions& options) = 0;
   virtual bool SendRtcp(const uint8_t* packet, size_t length) = 0;
 
  protected:
   virtual ~Transport() {}
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_VIDEO_ENGINE_NEW_INCLUDE_TRANSPORT_H_