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/stunserver/stunserver_main.cc

@@ -0,0 +1,51 @@
+/*
+ *  Copyright 2004 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.
+ */
+
+#if defined(WEBRTC_POSIX)
+#include <errno.h>
+#endif  // WEBRTC_POSIX
+
+#include <iostream>
+
+#include "webrtc/p2p/base/stunserver.h"
+#include "webrtc/base/thread.h"
+
+using namespace cricket;
+
+int main(int argc, char* argv[]) {
+  if (argc != 2) {
+    std::cerr << "usage: stunserver address" << std::endl;
+    return 1;
+  }
+
+  rtc::SocketAddress server_addr;
+  if (!server_addr.FromString(argv[1])) {
+    std::cerr << "Unable to parse IP address: " << argv[1];
+    return 1;
+  }
+
+  rtc::Thread *pthMain = rtc::Thread::Current();
+
+  rtc::AsyncUDPSocket* server_socket =
+      rtc::AsyncUDPSocket::Create(pthMain->socketserver(), server_addr);
+  if (!server_socket) {
+    std::cerr << "Failed to create a UDP socket" << std::endl;
+    return 1;
+  }
+
+  StunServer* server = new StunServer(server_socket);
+
+  std::cout << "Listening at " << server_addr.ToString() << std::endl;
+
+  pthMain->Run();
+
+  delete server;
+  return 0;
+}