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

media/cast/transport/pacing/mock_paced_packet_sender.h

Index: media/cast/transport/pacing/mock_paced_packet_sender.h
diff --git a/media/cast/transport/pacing/mock_paced_packet_sender.h b/media/cast/transport/pacing/mock_paced_packet_sender.h
index 9f6d204f7febe55b0a67229912f9887a96fb4e95..d38e0e1b1a4dfc64f3f7a2aa0c35fde315310416 100644
--- a/media/cast/transport/pacing/mock_paced_packet_sender.h
+++ b/media/cast/transport/pacing/mock_paced_packet_sender.h
@@ -18,7 +18,8 @@ class MockPacedPacketSender : public PacedPacketSender {
   virtual ~MockPacedPacketSender();
 
   MOCK_METHOD1(SendPackets, bool(const SendPacketVector& packets));
-  MOCK_METHOD1(ResendPackets, bool(const SendPacketVector& packets));
+  MOCK_METHOD2(ResendPackets, bool(const SendPacketVector& packets,
+                                   base::TimeDelta rtt));
   MOCK_METHOD2(SendRtcpPacket, bool(unsigned int ssrc, PacketRef packet));
   MOCK_METHOD1(CancelSendingPacket, void(const PacketKey& packet_key));
 };