Wire up RTP keep-alive in ortc api.

webrtc/pc/rtptransport.cc

Index: webrtc/pc/rtptransport.cc
diff --git a/webrtc/pc/rtptransport.cc b/webrtc/pc/rtptransport.cc
index 6b0141fc8e92986e2ec690360f3a97805cf17ee6..c8cc31bb441e2bfa23361d97b5427ca04b226afe 100644
--- a/webrtc/pc/rtptransport.cc
+++ b/webrtc/pc/rtptransport.cc
@@ -135,6 +135,16 @@ RtcpParameters RtpTransport::GetRtcpParameters() const {
   return rtcp_parameters_;
 }
 
+RTCError RtpTransport::SetRtpTransportParameters(
+    const RtpTransportParameters& parameters) {
+  rtp_transport_parameters_ = parameters;
+  return RTCError::OK();
+}
+
+RtpTransportParameters RtpTransport::GetRtpTransportParameters() const {
+  return rtp_transport_parameters_;
+}
+
 RtpTransportAdapter* RtpTransport::GetInternal() {
   return nullptr;
 }