Propagate bitrate setting to RTCRtpSender.

webrtc/examples/objc/AppRTCMobile/ios/ARDSettingsModel.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.
  */
 
 #import <Foundation/Foundation.h>
 
 NS_ASSUME_NONNULL_BEGIN
 /**
  * Model class for user defined settings.

[tkchin_webrtc, 2016/11/14 21:14:32]

Not that this is wrong, but the rest of codebase uses different comment format
for /**

  *
  * Currently used for streaming media constraints and bitrate only.
  * In future audio media constraints support can be added as well.
  * Offers list of avaliable video resolutions that can construct streaming media constraint.
  * Exposes methods for reading and storing media constraints from persistent store.
  * Also translates current user defined media constraint into RTCMediaConstraints
  * dictionary.
  */
 @interface ARDSettingsModel : NSObject
 
@@ skipping 22 matching lines @@
  */
 - (BOOL)storeVideoResoultionConstraint:(NSString *)constraint;
 
 /**
  * Converts the current media constraints from store into dictionary with RTCMediaConstraints
  * values.
  *
  * @return NSDictionary with RTC width and height parameters
  */
 - (nullable NSDictionary *)currentMediaConstraintFromStoreAsRTCDictionary;
+
+/**
+ * Returns current max bitrate setting from store if present.
+ */
+- (nullable NSNumber *)currentMaxBitrateSettingFromStore;
+
+/**
+ * Stores the provided bitrate value into the store.
+ *
+ * @param bitrate NSNumber representation of the max bitrate value.
+ */
+- (void)storeMaxBitrateSetting:(nullable NSNumber *)bitrate;
+
 @end
 NS_ASSUME_NONNULL_END