Add a PacketOptions struct to webrtc::Transport.

webrtc/call/transport_adapter.h

Index: webrtc/call/transport_adapter.h
diff --git a/webrtc/call/transport_adapter.h b/webrtc/call/transport_adapter.h
index 07ea7163981253e4aeca189e2012be4ef7f803da..72f9baabcfab123628bb215520cc102f207f84f7 100644
--- a/webrtc/call/transport_adapter.h
+++ b/webrtc/call/transport_adapter.h
@@ -21,7 +21,9 @@ class TransportAdapter : public Transport {
  public:
   explicit TransportAdapter(Transport* transport);
 
-  bool SendRtp(const uint8_t* packet, size_t length) override;
+  bool SendRtp(const uint8_t* packet,
+               size_t length,
+               const PacketOptions& options) override;
   bool SendRtcp(const uint8_t* packet, size_t length) override;
 
   void Enable();