iOS: Add maxFramerate to RtpEncodingParameters.

iOS counterpart of https://webrtc-review.googlesource.com/c/src/+/91440.

Bug: webrtc:9597
Change-Id: Iba426dc3b8acec3c90996ffa012d5dfc833c16f5
Reviewed-on: https://webrtc-review.googlesource.com/102260
Reviewed-by: Anders Carlsson <andersc@webrtc.org>
Commit-Queue: Rasmus Brandt <brandtr@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24857}
diff --git a/sdk/objc/api/peerconnection/RTCRtpEncodingParameters.h b/sdk/objc/api/peerconnection/RTCRtpEncodingParameters.h
index 0634791..0ac8ad9 100644
--- a/sdk/objc/api/peerconnection/RTCRtpEncodingParameters.h
+++ b/sdk/objc/api/peerconnection/RTCRtpEncodingParameters.h
@@ -27,11 +27,14 @@
 
 /** The minimum bitrate to use for the encoding, or nil if there is no
  *  limit.
- *
- *  Not implemented.
  */
 @property(nonatomic, copy, nullable) NSNumber *minBitrateBps;
 
+/** The maximum framerate to use for the encoding, or nil if there is no
+ *  limit.
+ */
+@property(nonatomic, copy, nullable) NSNumber *maxFramerate;
+
 /** The SSRC being used by this encoding. */
 @property(nonatomic, readonly, nullable) NSNumber *ssrc;