Add Cast PLI support on sender side.

media/cast/net/cast_transport_sender_impl_unittest.cc

Index: media/cast/net/cast_transport_sender_impl_unittest.cc
diff --git a/media/cast/net/cast_transport_sender_impl_unittest.cc b/media/cast/net/cast_transport_sender_impl_unittest.cc
index f2e9d5cd8469c90d5cf6058af34ebd53e21da02f..fa774b639f96c3f0bde5255cd73ae530db5a6994 100644
--- a/media/cast/net/cast_transport_sender_impl_unittest.cc
+++ b/media/cast/net/cast_transport_sender_impl_unittest.cc
@@ -96,7 +96,7 @@ class CastTransportSenderImplTest : public ::testing::Test {
     rtp_config.feedback_ssrc = 2;
     rtp_config.rtp_payload_type = 3;
     transport_sender_->InitializeVideo(rtp_config, RtcpCastMessageCallback(),
-                                       RtcpRttCallback());
+                                       RtcpRttCallback(), RtcpPliCallback());
   }
 
   void InitializeAudio() {
@@ -105,7 +105,7 @@ class CastTransportSenderImplTest : public ::testing::Test {
     rtp_config.feedback_ssrc = 3;
     rtp_config.rtp_payload_type = 4;
     transport_sender_->InitializeAudio(rtp_config, RtcpCastMessageCallback(),
-                                       RtcpRttCallback());
+                                       RtcpRttCallback(), RtcpPliCallback());
   }
 
   base::SimpleTestTickClock testing_clock_;