Update API for Objective-C RTCConfiguration.

webrtc/api/objc/RTCIceServer.mm

 /*
  *  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 43 matching lines @@
   iceServer.password = [NSString stdStringForString:_credential];
 
   [_urlStrings enumerateObjectsUsingBlock:^(NSString *url,
                                             NSUInteger idx,
                                             BOOL *stop) {
     iceServer.urls.push_back(url.stdString);
   }];
   return iceServer;
 }
 
+- (instancetype)initWithNativeServer:
+    (webrtc::PeerConnectionInterface::IceServer)nativeServer {
+  NSMutableArray *urls =
+      [NSMutableArray arrayWithCapacity:nativeServer.urls.size()];
+  for (auto const &url : nativeServer.urls) {
+    [urls addObject:[NSString stringForStdString:url]];
+  }
+  NSString *username = [NSString stringForStdString:nativeServer.username];
+  NSString *credential = [NSString stringForStdString:nativeServer.password];
+  self = [self initWithURLStrings:urls
+                         username:username
+                       credential:credential];
+  return self;
+}
+
 @end