Update iOS AppRTCDemo to use level controller.

webrtc/examples/objc/AppRTCDemo/ios/ARDMainViewController.m

 /*
  *  Copyright 2015 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 36 matching lines @@
   RTCAudioSession *session = [RTCAudioSession sharedInstance];
   [session addDelegate:self];
 
   [self configureAudioSession];
   [self setupAudioPlayer];
 }
 
 #pragma mark - ARDMainViewDelegate
 
 - (void)mainView:(ARDMainView *)mainView
-         didInputRoom:(NSString *)room
-           isLoopback:(BOOL)isLoopback
-          isAudioOnly:(BOOL)isAudioOnly
-    shouldMakeAecDump:(BOOL)shouldMakeAecDump
-    useManualAudio:(BOOL)useManualAudio {
+             didInputRoom:(NSString *)room
+               isLoopback:(BOOL)isLoopback
+              isAudioOnly:(BOOL)isAudioOnly
+        shouldMakeAecDump:(BOOL)shouldMakeAecDump
+    shouldUseLevelControl:(BOOL)shouldUseLevelControl
+           useManualAudio:(BOOL)useManualAudio {
   if (!room.length) {
     [self showAlertWithMessage:@"Missing room name."];
     return;
   }
   // Trim whitespaces.
   NSCharacterSet *whitespaceSet = [NSCharacterSet whitespaceCharacterSet];
   NSString *trimmedRoom = [room stringByTrimmingCharactersInSet:whitespaceSet];
 
   // Check that room name is valid.
   NSError *error = nil;
@@ skipping 19 matching lines @@
   RTCAudioSession *session = [RTCAudioSession sharedInstance];
   session.useManualAudio = useManualAudio;
   session.isAudioEnabled = NO;
 
   // Kick off the video call.
   ARDVideoCallViewController *videoCallViewController =
       [[ARDVideoCallViewController alloc] initForRoom:trimmedRoom
                                            isLoopback:isLoopback
                                           isAudioOnly:isAudioOnly
                                     shouldMakeAecDump:shouldMakeAecDump
+                                shouldUseLevelControl:shouldUseLevelControl
                                              delegate:self];
   videoCallViewController.modalTransitionStyle =
       UIModalTransitionStyleCrossDissolve;
   [self presentViewController:videoCallViewController
                      animated:YES
                    completion:nil];
 }
 
 - (void)mainViewDidToggleAudioLoop:(ARDMainView *)mainView {
   if (mainView.isAudioLoopPlaying) {
@@ skipping 89 matching lines @@
 - (void)showAlertWithMessage:(NSString*)message {
   UIAlertView* alertView = [[UIAlertView alloc] initWithTitle:nil
                                                       message:message
                                                      delegate:nil
                                             cancelButtonTitle:@"OK"
                                             otherButtonTitles:nil];
   [alertView show];
 }
 
 @end