Revert of Remove webrtc/libjingle/{xmllite,xmpp}

webrtc/libjingle/xmllite/qname.h

Index: webrtc/libjingle/xmllite/qname.h
diff --git a/webrtc/libjingle/xmllite/qname.h b/webrtc/libjingle/xmllite/qname.h
new file mode 100644
index 0000000000000000000000000000000000000000..1e772d3d676a39ad23a81fa5f06fd4adbf97cce7
--- /dev/null
+++ b/webrtc/libjingle/xmllite/qname.h
@@ -0,0 +1,83 @@
+/*
+ *  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_QNAME_H_
+#define WEBRTC_LIBJINGLE_XMLLITE_QNAME_H_
+
+#include <string>
+
+namespace buzz {
+
+class QName;
+
+// StaticQName is used to represend constant quailified names. They
+// can be initialized statically and don't need intializers code, e.g.
+//   const StaticQName QN_FOO = { "foo_namespace", "foo" };
+//
+// Beside this use case, QName should be used everywhere
+// else. StaticQName instances are implicitly converted to QName
+// objects.
+struct StaticQName {
+  const char* const ns;
+  const char* const local;
+
+  bool operator==(const QName& other) const;
+  bool operator!=(const QName& other) const;
+};
+
+class QName {
+ public:
+  QName();
+  QName(const QName& qname);
+  QName(const StaticQName& const_value);
+  QName(const std::string& ns, const std::string& local);
+  explicit QName(const std::string& merged_or_local);
+  ~QName();
+
+  const std::string& Namespace() const { return namespace_; }
+  const std::string& LocalPart() const { return local_part_; }
+  std::string Merged() const;
+  bool IsEmpty() const;
+
+  int Compare(const StaticQName& other) const;
+  int Compare(const QName& other) const;
+
+  bool operator==(const StaticQName& other) const {
+    return Compare(other) == 0;
+  }
+  bool operator==(const QName& other) const {
+    return Compare(other) == 0;
+  }
+  bool operator!=(const StaticQName& other) const {
+    return Compare(other) != 0;
+  }
+  bool operator!=(const QName& other) const {
+    return Compare(other) != 0;
+  }
+  bool operator<(const QName& other) const {
+    return Compare(other) < 0;
+  }
+
+ private:
+  std::string namespace_;
+  std::string local_part_;
+};
+
+inline bool StaticQName::operator==(const QName& other) const {
+  return other.Compare(*this) == 0;
+}
+
+inline bool StaticQName::operator!=(const QName& other) const {
+  return other.Compare(*this) != 0;
+}
+
+}  // namespace buzz
+
+#endif  // WEBRTC_LIBJINGLE_XMLLITE_QNAME_H_