Add priority to RTCRtpEncodingParameters.

Expose two parameters in the Obj-C wrapper.

Bug: webrtc:10438
Change-Id: I3be424720c927d95b0df908ab7cca1bb0613ada8
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/135122
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Reviewed-by: Peter Hanspers <peterhanspers@webrtc.org>
Commit-Queue: Anders Carlsson <andersc@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27845}
diff --git a/sdk/objc/api/peerconnection/RTCRtpEncodingParameters.h b/sdk/objc/api/peerconnection/RTCRtpEncodingParameters.h
index dce2512..c3e3889 100644
--- a/sdk/objc/api/peerconnection/RTCRtpEncodingParameters.h
+++ b/sdk/objc/api/peerconnection/RTCRtpEncodingParameters.h
@@ -51,6 +51,12 @@
 /** The SSRC being used by this encoding. */
 @property(nonatomic, readonly, nullable) NSNumber *ssrc;
 
+/** The relative bitrate priority. */
+@property(nonatomic, assign) double bitratePriority;
+
+/** The relative DiffServ Code Point priority. */
+@property(nonatomic, assign) double networkPriority;
+
 - (instancetype)init NS_DESIGNATED_INITIALIZER;
 
 @end