Wire up RTP keep-alive in ortc api.

webrtc/pc/rtptransport.h

Index: webrtc/pc/rtptransport.h
diff --git a/webrtc/pc/rtptransport.h b/webrtc/pc/rtptransport.h
index 87f29bac2a1be173411e6c086c5a7e064f2f0ab1..c43992d1d66299313d74897028bb6bd71afdef19 100644
--- a/webrtc/pc/rtptransport.h
+++ b/webrtc/pc/rtptransport.h
@@ -54,6 +54,10 @@ class RtpTransport : public RtpTransportInterface, public sigslot::has_slots<> {
   RTCError SetRtcpParameters(const RtcpParameters& parameters) override;
   RtcpParameters GetRtcpParameters() const override;
 
+  RTCError SetRtpTransportParameters(
+      const RtpTransportParameters& parameters) override;
+  RtpTransportParameters GetRtpTransportParameters() const override;
+
   // Called whenever a transport's ready-to-send state changes. The argument
   // is true if all used transports are ready to send. This is more specific
   // than just "writable"; it means the last send didn't return ENOTCONN.
@@ -109,6 +113,7 @@ class RtpTransport : public RtpTransportInterface, public sigslot::has_slots<> {
   bool rtcp_ready_to_send_ = false;
 
   RtcpParameters rtcp_parameters_;
+  RtpTransportParameters rtp_transport_parameters_;
 
   cricket::BundleFilter bundle_filter_;
 };