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diff --git a/third_party/libwebrtc/examples/objc/AppRTCMobile/ARDJoinResponse.m b/third_party/libwebrtc/examples/objc/AppRTCMobile/ARDJoinResponse.m
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index 0000000000..87d58e0db1
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+++ b/third_party/libwebrtc/examples/objc/AppRTCMobile/ARDJoinResponse.m
@@ -0,0 +1,82 @@
+/*
+ *  Copyright 2014 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 "ARDJoinResponse+Internal.h"
+
+#import "ARDSignalingMessage.h"
+#import "ARDUtilities.h"
+#import "RTCIceServer+JSON.h"
+
+static NSString const *kARDJoinResultKey = @"result";
+static NSString const *kARDJoinResultParamsKey = @"params";
+static NSString const *kARDJoinInitiatorKey = @"is_initiator";
+static NSString const *kARDJoinRoomIdKey = @"room_id";
+static NSString const *kARDJoinClientIdKey = @"client_id";
+static NSString const *kARDJoinMessagesKey = @"messages";
+static NSString const *kARDJoinWebSocketURLKey = @"wss_url";
+static NSString const *kARDJoinWebSocketRestURLKey = @"wss_post_url";
+
+@implementation ARDJoinResponse
+
+@synthesize result = _result;
+@synthesize isInitiator = _isInitiator;
+@synthesize roomId = _roomId;
+@synthesize clientId = _clientId;
+@synthesize messages = _messages;
+@synthesize webSocketURL = _webSocketURL;
+@synthesize webSocketRestURL = _webSocketRestURL;
+
++ (ARDJoinResponse *)responseFromJSONData:(NSData *)data {
+  NSDictionary *responseJSON = [NSDictionary dictionaryWithJSONData:data];
+  if (!responseJSON) {
+    return nil;
+  }
+  ARDJoinResponse *response = [[ARDJoinResponse alloc] init];
+  NSString *resultString = responseJSON[kARDJoinResultKey];
+  response.result = [[self class] resultTypeFromString:resultString];
+  NSDictionary *params = responseJSON[kARDJoinResultParamsKey];
+
+  response.isInitiator = [params[kARDJoinInitiatorKey] boolValue];
+  response.roomId = params[kARDJoinRoomIdKey];
+  response.clientId = params[kARDJoinClientIdKey];
+
+  // Parse messages.
+  NSArray *messages = params[kARDJoinMessagesKey];
+  NSMutableArray *signalingMessages =
+      [NSMutableArray arrayWithCapacity:messages.count];
+  for (NSString *message in messages) {
+    ARDSignalingMessage *signalingMessage =
+        [ARDSignalingMessage messageFromJSONString:message];
+    [signalingMessages addObject:signalingMessage];
+  }
+  response.messages = signalingMessages;
+
+  // Parse websocket urls.
+  NSString *webSocketURLString = params[kARDJoinWebSocketURLKey];
+  response.webSocketURL = [NSURL URLWithString:webSocketURLString];
+  NSString *webSocketRestURLString = params[kARDJoinWebSocketRestURLKey];
+  response.webSocketRestURL = [NSURL URLWithString:webSocketRestURLString];
+
+  return response;
+}
+
+#pragma mark - Private
+
++ (ARDJoinResultType)resultTypeFromString:(NSString *)resultString {
+  ARDJoinResultType result = kARDJoinResultTypeUnknown;
+  if ([resultString isEqualToString:@"SUCCESS"]) {
+    result = kARDJoinResultTypeSuccess;
+  } else if ([resultString isEqualToString:@"FULL"]) {
+    result = kARDJoinResultTypeFull;
+  }
+  return result;
+}
+
+@end