Add the function ToRtpParameters.

webrtc/ortc/rtpparametersconversion.h

Index: webrtc/ortc/rtpparametersconversion.h
diff --git a/webrtc/ortc/rtpparametersconversion.h b/webrtc/ortc/rtpparametersconversion.h
index a466895bf49d7582032814e673ff6a6dc716d98a..d2c91299ef6255af87bcf2e82dec708f21d3bdc4 100644
--- a/webrtc/ortc/rtpparametersconversion.h
+++ b/webrtc/ortc/rtpparametersconversion.h
@@ -83,6 +83,12 @@ RTCErrorOr<cricket::StreamParamsVec> ToCricketStreamParamsVec(
 rtc::Optional<RtcpFeedback> ToRtcpFeedback(
     const cricket::FeedbackParam& cricket_feedback);
 
+std::vector<RtpEncodingParameters> ToRtpEncodings(
+    const cricket::StreamParamsVec& stream_params);
+
+template <typename C>
+RtpCodecParameters ToRtpCodecParameters(const C& cricket_codec);
+
 template <typename C>
 RtpCodecCapability ToRtpCodecCapability(const C& cricket_codec);
 
@@ -91,6 +97,12 @@ RtpCapabilities ToRtpCapabilities(
     const std::vector<C>& cricket_codecs,
     const cricket::RtpHeaderExtensions& cricket_extensions);
 
+template <class C>
+RtpParameters ToRtpParameters(
+    const std::vector<C>& cricket_codecs,
+    const cricket::RtpHeaderExtensions& cricket_extensions,
+    const cricket::StreamParamsVec& stream_params);
+
 }  // namespace webrtc
 
 #endif  // WEBRTC_ORTC_RTPPARAMETERSCONVERSION_H_