Made XmlWriter able to write elements with both attributes and content.

third_party/libxml/chromium/libxml_utils.h

 // Copyright (c) 2012 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 THIRD_PARTY_LIBXML_CHROMIUM_LIBXML_UTILS_H_
 #define THIRD_PARTY_LIBXML_CHROMIUM_LIBXML_UTILS_H_
 #pragma once
 
 #include <string>
 
@@ skipping 115 matching lines @@
   bool StartElement(const std::string& element_name) {
     return xmlTextWriterStartElement(writer_,
                                      BAD_CAST element_name.c_str()) >= 0;
   }
 
   // Ends the current open element. Returns false on error.
   bool EndElement() {
     return xmlTextWriterEndElement(writer_) >= 0;
   }
 
+  // Appends to the content of the current open element.
+  bool AppendElementContent(const std::string& content) {
+    return xmlTextWriterWriteString(writer_,
+                                    BAD_CAST content.c_str()) >= 0;
+  }
+
   // Adds an attribute to the current open element. Returns false on error.
   bool AddAttribute(const std::string& attribute_name,
                     const std::string& attribute_value) {
     return xmlTextWriterWriteAttribute(writer_,
                                        BAD_CAST attribute_name.c_str(),
                                        BAD_CAST attribute_value.c_str()) >= 0;
   }
 
   // Adds a new element with name |element_name| and content |content|
   // to the buffer. Example: <|element_name|>|content|</|element_name|>
@@ skipping 16 matching lines @@
 
  private:
   // The underlying libxml xmlTextWriter.
   xmlTextWriterPtr writer_;
 
   // Stores the output.
   xmlBufferPtr buffer_;
 };
 
 #endif  // THIRD_PARTY_LIBXML_CHROMIUM_INCLUDE_LIBXML_LIBXML_UTILS_H_