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

webrtc/libjingle/xmllite/xmlbuilder.h

Index: webrtc/libjingle/xmllite/xmlbuilder.h
diff --git a/webrtc/libjingle/xmllite/xmlbuilder.h b/webrtc/libjingle/xmllite/xmlbuilder.h
new file mode 100644
index 0000000000000000000000000000000000000000..3b48f2824797a5a3e1dcf1d39e6dd02227feef6e
--- /dev/null
+++ b/webrtc/libjingle/xmllite/xmlbuilder.h
@@ -0,0 +1,61 @@
+/*
+ *  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 _xmlbuilder_h_
+#define _xmlbuilder_h_
+
+#include <memory>
+#include <string>
+#include <vector>
+#include "webrtc/libjingle/xmllite/xmlparser.h"
+
+#ifdef EXPAT_RELATIVE_PATH
+#include "expat.h"
+#else
+#include "third_party/expat/v2_0_1/Source/lib/expat.h"
+#endif  // EXPAT_RELATIVE_PATH
+
+namespace buzz {
+
+class XmlElement;
+class XmlParseContext;
+
+
+class XmlBuilder : public XmlParseHandler {
+public:
+  XmlBuilder();
+
+  static XmlElement * BuildElement(XmlParseContext * pctx,
+                                  const char * name, const char ** atts);
+  virtual void StartElement(XmlParseContext * pctx,
+                            const char * name, const char ** atts);
+  virtual void EndElement(XmlParseContext * pctx, const char * name);
+  virtual void CharacterData(XmlParseContext * pctx,
+                             const char * text, int len);
+  virtual void Error(XmlParseContext * pctx, XML_Error);
+  virtual ~XmlBuilder();
+
+  void Reset();
+
+  // Take ownership of the built element; second call returns NULL
+  XmlElement * CreateElement();
+
+  // Peek at the built element without taking ownership
+  XmlElement * BuiltElement();
+
+private:
+  XmlElement * pelCurrent_;
+  std::unique_ptr<XmlElement> pelRoot_;
+  std::unique_ptr<std::vector<XmlElement*> > pvParents_;
+};
+
+}
+
+#endif