Create the SrtpTransportInterface.

webrtc/ortc/ortcfactory.h

Index: webrtc/ortc/ortcfactory.h
diff --git a/webrtc/ortc/ortcfactory.h b/webrtc/ortc/ortcfactory.h
index 71f525d88446a4cb2a578d5ce24c7fe3e57e44ea..8d67a3fa95a6e022a5950192e48f129ab5e25f26 100644
--- a/webrtc/ortc/ortcfactory.h
+++ b/webrtc/ortc/ortcfactory.h
@@ -49,6 +49,12 @@ class OrtcFactory : public OrtcFactoryInterface {
       PacketTransportInterface* rtcp,
       RtpTransportControllerInterface* transport_controller) override;
 
+  RTCErrorOr<std::unique_ptr<SrtpTransportInterface>> CreateSrtpTransport(
+      const RtcpParameters& rtcp_parameters,
+      PacketTransportInterface* rtp,
+      PacketTransportInterface* rtcp,
+      RtpTransportControllerInterface* transport_controller) override;
+
   RtpCapabilities GetRtpSenderCapabilities(
       cricket::MediaType kind) const override;