Add xmllite and xmpp sources to third_party/

third_party/xmllite/xmlprinter.h

+// Copyright 2004 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#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_