Add a PacketOptions struct to webrtc::Transport.

webrtc/modules/rtp_rtcp/source/rtp_sender.h

Index: webrtc/modules/rtp_rtcp/source/rtp_sender.h
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_sender.h b/webrtc/modules/rtp_rtcp/source/rtp_sender.h
index 564300f43c35b329c7ac13d70804a75022d36cc4..57516f8fe4fcae4958c30078d9284e96a5fafb8b 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_sender.h
+++ b/webrtc/modules/rtp_rtcp/source/rtp_sender.h
@@ -350,7 +350,9 @@ class RTPSender : public RTPSenderInterface {
   void BuildRtxPacket(uint8_t* buffer, size_t* length,
                       uint8_t* buffer_rtx);
 
-  bool SendPacketToNetwork(const uint8_t *packet, size_t size);
+  bool SendPacketToNetwork(const uint8_t* packet,
+                           size_t size,
+                           const PacketOptions& options);
 
   void UpdateDelayStatistics(int64_t capture_time_ms, int64_t now_ms);