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diff --git a/third_party/libwebrtc/examples/objc/AppRTCMobile/ARDWebSocketChannel.h b/third_party/libwebrtc/examples/objc/AppRTCMobile/ARDWebSocketChannel.h
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+++ b/third_party/libwebrtc/examples/objc/AppRTCMobile/ARDWebSocketChannel.h
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+/*
+ *  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 <Foundation/Foundation.h>
+
+#import "ARDSignalingChannel.h"
+
+// Wraps a WebSocket connection to the AppRTC WebSocket server.
+@interface ARDWebSocketChannel : NSObject <ARDSignalingChannel>
+
+- (instancetype)initWithURL:(NSURL *)url
+                    restURL:(NSURL *)restURL
+                   delegate:(id<ARDSignalingChannelDelegate>)delegate;
+
+// Registers with the WebSocket server for the given room and client id once
+// the web socket connection is open.
+- (void)registerForRoomId:(NSString *)roomId clientId:(NSString *)clientId;
+
+// Sends message over the WebSocket connection if registered, otherwise POSTs to
+// the web socket server instead.
+- (void)sendMessage:(ARDSignalingMessage *)message;
+
+@end
+
+// Loopback mode is used to cause the client to connect to itself for testing.
+// A second web socket connection is established simulating the other client.
+// Any messages received are sent back to the WebSocket server after modifying
+// them as appropriate.
+@interface ARDLoopbackWebSocketChannel : ARDWebSocketChannel
+
+- (instancetype)initWithURL:(NSURL *)url restURL:(NSURL *)restURL;
+
+@end