Cast: Avoid retransmit if we sent the same packet recently (less than RTT)

media/cast/transport/rtp_sender/rtp_sender.h

Index: media/cast/transport/rtp_sender/rtp_sender.h
diff --git a/media/cast/transport/rtp_sender/rtp_sender.h b/media/cast/transport/rtp_sender/rtp_sender.h
index bfb46cb09e60135b6d7656a7fef626b7a946831e..e65326abf1657b3aa00d0497cc0c68f48275e9eb 100644
--- a/media/cast/transport/rtp_sender/rtp_sender.h
+++ b/media/cast/transport/rtp_sender/rtp_sender.h
@@ -51,7 +51,8 @@ class RtpSender {
   void SendFrame(const EncodedFrame& frame);
 
   void ResendPackets(const MissingFramesAndPacketsMap& missing_packets,
-                     bool cancel_rtx_if_not_in_list);
+                     bool cancel_rtx_if_not_in_list,
+                     base::TimeDelta dedupe_window);
 
   size_t send_packet_count() const {
     return packetizer_ ? packetizer_->send_packet_count() : 0;