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;
 
diff --git a/sdk/objc/api/peerconnection/RTCRtpEncodingParameters.mm b/sdk/objc/api/peerconnection/RTCRtpEncodingParameters.mm
index 299e318..3246371 100644
--- a/sdk/objc/api/peerconnection/RTCRtpEncodingParameters.mm
+++ b/sdk/objc/api/peerconnection/RTCRtpEncodingParameters.mm
@@ -15,6 +15,7 @@
 @synthesize isActive = _isActive;
 @synthesize maxBitrateBps = _maxBitrateBps;
 @synthesize minBitrateBps = _minBitrateBps;
+@synthesize maxFramerate = _maxFramerate;
 @synthesize ssrc = _ssrc;
 
 - (instancetype)init {
@@ -33,6 +34,9 @@
       _minBitrateBps =
           [NSNumber numberWithInt:*nativeParameters.min_bitrate_bps];
     }
+    if (nativeParameters.max_framerate) {
+      _maxFramerate = [NSNumber numberWithInt:*nativeParameters.max_framerate];
+    }
     if (nativeParameters.ssrc) {
       _ssrc = [NSNumber numberWithUnsignedLong:*nativeParameters.ssrc];
     }
@@ -49,6 +53,9 @@
   if (_minBitrateBps != nil) {
     parameters.min_bitrate_bps = absl::optional<int>(_minBitrateBps.intValue);
   }
+  if (_maxFramerate != nil) {
+    parameters.max_framerate = absl::optional<int>(_maxFramerate.intValue);
+  }
   if (_ssrc != nil) {
     parameters.ssrc = absl::optional<uint32_t>(_ssrc.unsignedLongValue);
   }