Implemented XMLSerializer in PrivateScript.

Source/core/xml/DocumentXMLSerializer.h

Index: Source/core/xml/DocumentXMLSerializer.h
diff --git a/Source/core/xml/DocumentXMLSerializer.h b/Source/core/xml/DocumentXMLSerializer.h
new file mode 100644
index 0000000000000000000000000000000000000000..01295633e0850c191cd46adadf4204df6c31674d
--- /dev/null
+++ b/Source/core/xml/DocumentXMLSerializer.h
@@ -0,0 +1,26 @@
+// Copyright 2014 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 DocumentXMLSerializer_h
+#define DocumentXMLSerializer_h
+
+#include "core/dom/Document.h"
+
+namespace blink {
+
+class DocumentXMLSerializer {
+public:
+    static bool hasXMLDeclaration(Document& document)
+    {
+        return document.hasXMLDeclaration();
+    }
+
+    static bool isXMLStandaloneSpecified(Document& document)
+    {
+        return document.xmlStandaloneStatus() != Document::StandaloneUnspecified;
+    }
+};
+
+}
+#endif