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/ARDAppClient.h b/webrtc/examples/objc/AppRTCDemo/ARDAppClient.h
new file mode 100644
index 0000000..04993e4
--- /dev/null
+++ b/webrtc/examples/objc/AppRTCDemo/ARDAppClient.h
@@ -0,0 +1,67 @@
+/*
+ *  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 "RTCVideoTrack.h"
+
+typedef NS_ENUM(NSInteger, ARDAppClientState) {
+  // Disconnected from servers.
+  kARDAppClientStateDisconnected,
+  // Connecting to servers.
+  kARDAppClientStateConnecting,
+  // Connected to servers.
+  kARDAppClientStateConnected,
+};
+
+@class ARDAppClient;
+// The delegate is informed of pertinent events and will be called on the
+// main queue.
+@protocol ARDAppClientDelegate <NSObject>
+
+- (void)appClient:(ARDAppClient *)client
+    didChangeState:(ARDAppClientState)state;
+
+- (void)appClient:(ARDAppClient *)client
+    didChangeConnectionState:(RTCICEConnectionState)state;
+
+- (void)appClient:(ARDAppClient *)client
+    didReceiveLocalVideoTrack:(RTCVideoTrack *)localVideoTrack;
+
+- (void)appClient:(ARDAppClient *)client
+    didReceiveRemoteVideoTrack:(RTCVideoTrack *)remoteVideoTrack;
+
+- (void)appClient:(ARDAppClient *)client
+         didError:(NSError *)error;
+
+@end
+
+// Handles connections to the AppRTC server for a given room. Methods on this
+// class should only be called from the main queue.
+@interface ARDAppClient : NSObject
+
+@property(nonatomic, readonly) ARDAppClientState state;
+@property(nonatomic, weak) id<ARDAppClientDelegate> delegate;
+
+// Convenience constructor since all expected use cases will need a delegate
+// in order to receive remote tracks.
+- (instancetype)initWithDelegate:(id<ARDAppClientDelegate>)delegate;
+
+// Establishes a connection with the AppRTC servers for the given room id.
+// TODO(tkchin): provide available keys/values for options. This will be used
+// for call configurations such as overriding server choice, specifying codecs
+// and so on.
+- (void)connectToRoomWithId:(NSString *)roomId
+                    options:(NSDictionary *)options;
+
+// Disconnects from the AppRTC servers and any connected clients.
+- (void)disconnect;
+
+@end