Move ready to send logic from BaseChannel to RtpTransport.

webrtc/pc/rtptransport.cc

Index: webrtc/pc/rtptransport.cc
diff --git a/webrtc/pc/rtptransport.cc b/webrtc/pc/rtptransport.cc
index 76bc639cbcfb3685e40ef46bb605d1198225f4d3..1d5fb77eaf97bbfbc716fde8df55a8602adb1e5c 100644
--- a/webrtc/pc/rtptransport.cc
+++ b/webrtc/pc/rtptransport.cc
@@ -25,6 +25,38 @@ void RtpTransport::set_rtcp_packet_transport(
   rtcp_packet_transport_ = rtcp;
 }
 
+void RtpTransport::Connect(bool rtcp) {
+  rtc::PacketTransportInternal* transport =
+      rtcp ? rtcp_packet_transport_ : rtp_packet_transport_;
+  RTC_DCHECK(transport);
+  transport->SignalReadyToSend.connect(this, &RtpTransport::OnReadyToSend);
+}
+
+void RtpTransport::Disconnect(bool rtcp) {
+  rtc::PacketTransportInternal* transport =
+      rtcp ? rtcp_packet_transport_ : rtp_packet_transport_;
+  RTC_DCHECK(transport);
+  transport->SignalReadyToSend.disconnect(this);
+}
+
+void RtpTransport::OnReadyToSend(rtc::PacketTransportInternal* transport) {
+  SetReadyToSend(transport == rtcp_packet_transport_, true);
+}
+
+void RtpTransport::SetReadyToSend(bool rtcp, bool ready) {
+  if (rtcp) {
+    rtcp_ready_to_send_ = ready;
+  } else {
+    rtp_ready_to_send_ = ready;
+  }
+
+  // In the case of rtcp mux |rtcp_packet_transport_| will be null.
+  // TODO(zstein): A better way to verify that rtcp mux is enabled.
+  bool ready_to_send =
+      rtp_ready_to_send_ && (rtcp_ready_to_send_ || !rtcp_packet_transport_);
+  SignalReadyToSend(ready_to_send);
+}
+
 PacketTransportInterface* RtpTransport::GetRtpPacketTransport() const {
   return rtp_packet_transport_;
 }