iAppRTCDemo: WebSocket based signaling.

Updates the iOS code to use the new signaling model. Removes old Channel API
code. Note that this no longer logs messages to UI. UI update forthcoming.

BUG=
R=glaznev@webrtc.org, jiayl@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/35369004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7852 4adac7df-926f-26a2-2b94-8c16560cd09d

talk/examples/objc/AppRTCDemo/ARDWebSocketChannel.h

@@ -0,0 +1,75 @@
+/*
+ * libjingle
+ * Copyright 2014, Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import <Foundation/Foundation.h>
+
+#import "ARDSignalingMessage.h"
+
+typedef NS_ENUM(NSInteger, ARDWebSocketChannelState) {
+  // State when disconnected.
+  kARDWebSocketChannelStateClosed,
+  // State when connection is established but not ready for use.
+  kARDWebSocketChannelStateOpen,
+  // State when connection is established and registered.
+  kARDWebSocketChannelStateRegistered,
+  // State when connection encounters a fatal error.
+  kARDWebSocketChannelStateError
+};
+
+@class ARDWebSocketChannel;
+@protocol ARDWebSocketChannelDelegate <NSObject>
+
+- (void)channel:(ARDWebSocketChannel *)channel
+    didChangeState:(ARDWebSocketChannelState)state;
+
+- (void)channel:(ARDWebSocketChannel *)channel
+    didReceiveMessage:(ARDSignalingMessage *)message;
+
+@end
+
+// Wraps a WebSocket connection to the AppRTC WebSocket server.
+@interface ARDWebSocketChannel : NSObject
+
+@property(nonatomic, readonly) NSString *roomId;
+@property(nonatomic, readonly) NSString *clientId;
+@property(nonatomic, readonly) ARDWebSocketChannelState state;
+@property(nonatomic, weak) id<ARDWebSocketChannelDelegate> delegate;
+
+- (instancetype)initWithURL:(NSURL *)url
+                    restURL:(NSURL *)restURL
+                   delegate:(id<ARDWebSocketChannelDelegate>)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 data over the WebSocket connection if registered, otherwise POSTs to
+// the web socket server instead.
+- (void)sendData:(NSData *)data;
+
+@end