Add a PacketOptions struct to webrtc::Transport.

webrtc/voice_engine/channel.h

Index: webrtc/voice_engine/channel.h
diff --git a/webrtc/voice_engine/channel.h b/webrtc/voice_engine/channel.h
index e7e6d768a942c21ee4f49da613c7c3d8ebe5bf79..a55073896333a7ee07bf77a4c4ce230b9d2c2c6c 100644
--- a/webrtc/voice_engine/channel.h
+++ b/webrtc/voice_engine/channel.h
@@ -378,7 +378,9 @@ public:
                               uint8_t volume) override;
 
     // From Transport (called by the RTP/RTCP module)
-    bool SendRtp(const uint8_t* data, size_t len) override;
+    bool SendRtp(const uint8_t* data,
+                 size_t len,
+                 const PacketOptions& packet_options) override;
     bool SendRtcp(const uint8_t* data, size_t len) override;
 
     // From MixerParticipant