Propagate bitrate setting to RTCRtpSender.

webrtc/examples/objc/AppRTCMobile/ios/ARDSettingsStore.h

 /*
  *  Copyright 2016 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 12 matching lines @@
  * Returns current video resolution media constraint string stored in the store.
  */
 - (nullable NSString *)videoResolutionConstraintsSetting;
 
 /**
  * Stores the provided value as video resolution media constraint.
  * @param value the string to be stored
  */
 - (void)setVideoResolutionConstraintsSetting:(NSString *)value;
 
+/**
+ * Returns current max bitrate number stored in the store.
+ */
+- (nullable NSNumber *)maxBitrateSetting;
+
+/**
+ * Stores the provided value as maximum bitrate setting.
+ * @param value the number to be stored
+ */
+- (void)setMaxBitrateSetting:(nullable NSNumber *)value;
+
 @end
 NS_ASSUME_NONNULL_END