Add xmllite and xmpp sources to third_party/

third_party/xmpp/pubsubstateclient.cc

Index: third_party/xmpp/pubsubstateclient.cc
diff --git a/third_party/xmpp/pubsubstateclient.cc b/third_party/xmpp/pubsubstateclient.cc
new file mode 100644
index 0000000000000000000000000000000000000000..fb94892c38237b687310d51b785ff95d981265d4
--- /dev/null
+++ b/third_party/xmpp/pubsubstateclient.cc
@@ -0,0 +1,25 @@
+/*
+ *  Copyright 2011 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.
+ */
+
+#include "third_party/xmpp/pubsubstateclient.h"
+
+namespace buzz {
+
+std::string PublishedNickKeySerializer::GetKey(
+    const std::string& publisher_nick, const std::string& published_nick) {
+  return published_nick;
+}
+
+std::string PublisherAndPublishedNicksKeySerializer::GetKey(
+    const std::string& publisher_nick, const std::string& published_nick) {
+  return publisher_nick + ":" + published_nick;
+}
+
+}  // namespace buzz