Cast: Deduplicate packets in paced sender and always send older packets first

media/cast/transport/rtp_sender/rtp_packetizer/rtp_packetizer.h

Index: media/cast/transport/rtp_sender/rtp_packetizer/rtp_packetizer.h
diff --git a/media/cast/transport/rtp_sender/rtp_packetizer/rtp_packetizer.h b/media/cast/transport/rtp_sender/rtp_packetizer/rtp_packetizer.h
index c31b4d97882f26ff14f4b6cf39013fd8d2ed3a05..fb7293a4d34847a98dea69b587581d26c0cc862d 100644
--- a/media/cast/transport/rtp_sender/rtp_packetizer/rtp_packetizer.h
+++ b/media/cast/transport/rtp_sender/rtp_packetizer/rtp_packetizer.h
@@ -84,7 +84,8 @@ class RtpPacketizer {
             uint32 frame_id,
             uint32 reference_frame_id,
             uint32 timestamp,
-            const std::string& data);
+            const std::string& data,
+            const base::TimeTicks& capture_time);
 
   void BuildCommonRTPheader(Packet* packet, bool marker_bit, uint32 time_stamp);