Move all the examples from the talk directory into the webrtc examples directory.

Significant changes:

- move the libjingle_examples.gyp file into webrtc directory.
- rename talk/examples/android to webrtc/examples/androidapp to avoid name conflicts.
- update paths in talk/libjingle_tests.gyp to point to webrtc directory for Objective-C test.

BUG=
R=pthatcher@webrtc.org, tkchin@webrtc.org

Review URL: https://codereview.webrtc.org/1235563006 .

Cr-Commit-Position: refs/heads/master@{#9681}

webrtc/examples/objc/AppRTCDemo/ARDWebSocketChannel.h

@@ -0,0 +1,31 @@
+/*
+ *  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