Add xmllite and xmpp sources to third_party/

third_party/libjingle_xmpp/xmllite/xmlprinter.h

+/*
+ *  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.
+ */
+
+#ifndef WEBRTC_LIBJINGLE_XMLLITE_XMLPRINTER_H_
+#define WEBRTC_LIBJINGLE_XMLLITE_XMLPRINTER_H_
+
+#include <iosfwd>
+#include <string>
+
+namespace buzz {
+
+class XmlElement;
+class XmlnsStack;
+
+class XmlPrinter {
+ public:
+  static void PrintXml(std::ostream* pout, const XmlElement* pelt);
+
+  static void PrintXml(std::ostream* pout, const XmlElement* pelt,
+                       XmlnsStack* ns_stack);
+};
+
+}  // namespace buzz
+
+#endif  // WEBRTC_LIBJINGLE_XMLLITE_XMLPRINTER_H_