Add Cast PLI support on sender side.

media/cast/net/cast_transport_sender_impl.cc

Index: media/cast/net/cast_transport_sender_impl.cc
diff --git a/media/cast/net/cast_transport_sender_impl.cc b/media/cast/net/cast_transport_sender_impl.cc
index 29629679f08b99c31c579c368f1f5ee2dbe8d8a6..5f80580ff0f2d9065a6f71f14975fe1ee5a39281 100644
--- a/media/cast/net/cast_transport_sender_impl.cc
+++ b/media/cast/net/cast_transport_sender_impl.cc
@@ -98,7 +98,8 @@ CastTransportSenderImpl::~CastTransportSenderImpl() {
 void CastTransportSenderImpl::InitializeAudio(
     const CastTransportRtpConfig& config,
     const RtcpCastMessageCallback& cast_message_cb,
-    const RtcpRttCallback& rtt_cb) {
+    const RtcpRttCallback& rtt_cb,
+    const RtcpPliCallback& pli_cb) {
   LOG_IF(WARNING, config.aes_key.empty() || config.aes_iv_mask.empty())
       << "Unsafe to send audio with encryption DISABLED.";
   if (!audio_encryptor_.Initialize(config.aes_key, config.aes_iv_mask)) {
@@ -123,7 +124,7 @@ void CastTransportSenderImpl::InitializeAudio(
                  weak_factory_.GetWeakPtr(), config.ssrc, cast_message_cb),
       rtt_cb, base::Bind(&CastTransportSenderImpl::OnReceivedLogMessage,
                          weak_factory_.GetWeakPtr(), AUDIO_EVENT),
-      clock_, &pacer_, config.ssrc, config.feedback_ssrc));
+      pli_cb, clock_, &pacer_, config.ssrc, config.feedback_ssrc));
   pacer_.RegisterAudioSsrc(config.ssrc);
   AddValidSsrc(config.feedback_ssrc);
   transport_client_->OnStatusChanged(TRANSPORT_AUDIO_INITIALIZED);
@@ -132,7 +133,8 @@ void CastTransportSenderImpl::InitializeAudio(
 void CastTransportSenderImpl::InitializeVideo(
     const CastTransportRtpConfig& config,
     const RtcpCastMessageCallback& cast_message_cb,
-    const RtcpRttCallback& rtt_cb) {
+    const RtcpRttCallback& rtt_cb,
+    const RtcpPliCallback& pli_cb) {
   LOG_IF(WARNING, config.aes_key.empty() || config.aes_iv_mask.empty())
       << "Unsafe to send video with encryption DISABLED.";
   if (!video_encryptor_.Initialize(config.aes_key, config.aes_iv_mask)) {
@@ -152,7 +154,7 @@ void CastTransportSenderImpl::InitializeVideo(
                  weak_factory_.GetWeakPtr(), config.ssrc, cast_message_cb),
       rtt_cb, base::Bind(&CastTransportSenderImpl::OnReceivedLogMessage,
                          weak_factory_.GetWeakPtr(), VIDEO_EVENT),
-      clock_, &pacer_, config.ssrc, config.feedback_ssrc));
+      pli_cb, clock_, &pacer_, config.ssrc, config.feedback_ssrc));
   pacer_.RegisterVideoSsrc(config.ssrc);
   AddValidSsrc(config.feedback_ssrc);
   transport_client_->OnStatusChanged(TRANSPORT_VIDEO_INITIALIZED);