Wire up RTP keep-alive in ortc api.

webrtc/ortc/rtptransportadapter.h

Index: webrtc/ortc/rtptransportadapter.h
diff --git a/webrtc/ortc/rtptransportadapter.h b/webrtc/ortc/rtptransportadapter.h
index 6fbc162e999895b940afa4d1c1f058a9e13bdeab..277b251fbf9278ae3974b41538c018481d5ae1b2 100644
--- a/webrtc/ortc/rtptransportadapter.h
+++ b/webrtc/ortc/rtptransportadapter.h
@@ -54,6 +54,9 @@ class RtpTransportAdapter : public SrtpTransportInterface {
   PacketTransportInterface* GetRtcpPacketTransport() const override;
   RTCError SetRtcpParameters(const RtcpParameters& parameters) override;
   RtcpParameters GetRtcpParameters() const override { return rtcp_parameters_; }
+  RTCError SetRtpTransportParameters(
+      const RtpTransportParameters& parameters) override;
+  RtpTransportParameters GetRtpTransportParameters() const override;
 
   // SRTP specific implementation.
   RTCError SetSrtpSendKey(const cricket::CryptoParams& params) override;
@@ -95,6 +98,7 @@ class RtpTransportAdapter : public SrtpTransportInterface {
   std::unique_ptr<RtpTransportControllerInterface>
       owned_rtp_transport_controller_;
   RtcpParameters rtcp_parameters_;
+  RtpTransportParameters rtp_transport_parameters_;
 
   // SRTP specific members.
   rtc::Optional<cricket::CryptoParams> send_key_;