Add a PacketOptions struct to webrtc::Transport.

webrtc/transport.h

Index: webrtc/transport.h
diff --git a/webrtc/transport.h b/webrtc/transport.h
index 86b3e2e5ea8169c0f97c312fd84a765a37d6af5e..81a56748b5ce2f868fdeb11025e390397327a6ca 100644
--- a/webrtc/transport.h
+++ b/webrtc/transport.h
@@ -17,9 +17,15 @@
 
 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: