Implement a part of ProcessingInstruction by using PrivateScript

Source/core/xml/parser/XMLErrors.cpp

Index: Source/core/xml/parser/XMLErrors.cpp
diff --git a/Source/core/xml/parser/XMLErrors.cpp b/Source/core/xml/parser/XMLErrors.cpp
index dc78a9c802a435827ffe270da8061a8ce2f960e6..fa4519326229f9db8fc9c558e1846df1ffff7248 100644
--- a/Source/core/xml/parser/XMLErrors.cpp
+++ b/Source/core/xml/parser/XMLErrors.cpp
@@ -29,11 +29,13 @@
 #include "config.h"
 #include "core/xml/parser/XMLErrors.h"
 
+#include "bindings/core/v8/V8Document.h"
 #include "core/HTMLNames.h"
 #include "core/SVGNames.h"
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/dom/Text.h"
+#include "platform/RuntimeEnabledFeatures.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
@@ -151,7 +153,13 @@ void XMLErrors::insertErrorMessageBlock()
     String errorMessages = m_errorMessages.toString();
     RefPtrWillBeRawPtr<Element> reportElement = createXHTMLParserErrorHeader(m_document, errorMessages);
 
-    if (m_document->transformSourceDocument()) {
+    bool xsltTransformed = false;
+    if (!RuntimeEnabledFeatures::xsltInPrivateScriptEnabled()) {
+        xsltTransformed = m_document->transformSourceDocument();
+    } else {
+        V8Document::PrivateScript::xsltTransformedMethod(m_document->frame(), m_document, &xsltTransformed);
+    }
+    if (xsltTransformed) {
         Vector<Attribute> attributes;
         attributes.append(Attribute(styleAttr, "white-space: normal"));
         RefPtrWillBeRawPtr<Element> paragraph = m_document->createElement(pTag, true);