Propagate bitrate setting to RTCRtpSender.

webrtc/examples/objc/AppRTCMobile/ios/ARDSettingsModel.m

 /*
  *  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 28 matching lines @@
 }
 
 - (BOOL)storeVideoResoultionConstraint:(NSString *)constraint {
   if (![[self availableVideoResoultionsMediaConstraints] containsObject:constraint]) {
     return NO;
   }
   [[self settingsStore] setVideoResolutionConstraintsSetting:constraint];
   return YES;
 }
 
+- (nullable NSNumber *)currentMaxBitrateSettingFromStore {
+  return [[self settingsStore] maxBitrateSetting];
+}
+
+- (void)storeMaxBitrateSetting:(nullable NSNumber *)bitrate {
+  [[self settingsStore] setMaxBitrateSetting:bitrate];
+}
+
 #pragma mark - Testable
 
 - (ARDSettingsStore *)settingsStore {
   if (!_settingsStore) {
     _settingsStore = [[ARDSettingsStore alloc] init];
   }
   return _settingsStore;
 }
 
 - (nullable NSString *)currentVideoResolutionWidthFromStore {
@@ skipping 36 matching lines @@
     mediaConstraintsDictionary = @{
       kRTCMediaConstraintsMinWidth : widthConstraint,
       kRTCMediaConstraintsMinHeight : heightConstraint
     };
   }
   return mediaConstraintsDictionary;
 }
 
 @end
 NS_ASSUME_NONNULL_END