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}
diff --git a/webrtc/examples/objc/AppRTCDemo/ARDSignalingMessage.h b/webrtc/examples/objc/AppRTCDemo/ARDSignalingMessage.h
new file mode 100644
index 0000000..c33997f
--- /dev/null
+++ b/webrtc/examples/objc/AppRTCDemo/ARDSignalingMessage.h
@@ -0,0 +1,49 @@
+/*
+ *  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 "RTCICECandidate.h"
+#import "RTCSessionDescription.h"
+
+typedef enum {
+  kARDSignalingMessageTypeCandidate,
+  kARDSignalingMessageTypeOffer,
+  kARDSignalingMessageTypeAnswer,
+  kARDSignalingMessageTypeBye,
+} ARDSignalingMessageType;
+
+@interface ARDSignalingMessage : NSObject
+
+@property(nonatomic, readonly) ARDSignalingMessageType type;
+
++ (ARDSignalingMessage *)messageFromJSONString:(NSString *)jsonString;
+- (NSData *)JSONData;
+
+@end
+
+@interface ARDICECandidateMessage : ARDSignalingMessage
+
+@property(nonatomic, readonly) RTCICECandidate *candidate;
+
+- (instancetype)initWithCandidate:(RTCICECandidate *)candidate;
+
+@end
+
+@interface ARDSessionDescriptionMessage : ARDSignalingMessage
+
+@property(nonatomic, readonly) RTCSessionDescription *sessionDescription;
+
+- (instancetype)initWithDescription:(RTCSessionDescription *)description;
+
+@end
+
+@interface ARDByeMessage : ARDSignalingMessage
+@end