Wire up RTP keep-alive in ortc api.

[This CL is work in progress.]

Wire up the rtp keep-alive in webrtc::Call::Config using new
SetRtpTransportParameters() method on RtpTransportInterface.

BUG=webrtc:7907

Review-Url: https://codereview.webrtc.org/2981513002
Cr-Commit-Position: refs/heads/master@{#19287}
diff --git a/webrtc/ortc/testrtpparameters.h b/webrtc/ortc/testrtpparameters.h
index 87108ca..042dab2 100644
--- a/webrtc/ortc/testrtpparameters.h
+++ b/webrtc/ortc/testrtpparameters.h
@@ -30,10 +30,10 @@
 // parameters is applied properly should construct the parameters in the test
 // itself.
 
-inline RtcpParameters MakeRtcpMuxParameters() {
-  RtcpParameters rtcp_parameters;
-  rtcp_parameters.mux = true;
-  return rtcp_parameters;
+inline RtpTransportParameters MakeRtcpMuxParameters() {
+  RtpTransportParameters parameters;
+  parameters.rtcp.mux = true;
+  return parameters;
 }
 
 RtpParameters MakeMinimalOpusParameters();