Add a PacketOptions struct to webrtc::Transport.

webrtc/test/null_transport.cc

Index: webrtc/test/null_transport.cc
diff --git a/webrtc/test/null_transport.cc b/webrtc/test/null_transport.cc
index 3cba6386cd532589aaa0c70453fb385cd08e8383..7fa36d1246869cbdcba5228a296c72f804e34d4b 100644
--- a/webrtc/test/null_transport.cc
+++ b/webrtc/test/null_transport.cc
@@ -12,7 +12,9 @@
 namespace webrtc {
 namespace test {
 
-bool NullTransport::SendRtp(const uint8_t* packet, size_t length) {
+bool NullTransport::SendRtp(const uint8_t* packet,
+                            size_t length,
+                            const PacketOptions& options) {
   return true;
 }