Make DOMParser create documents with a context document set

Source/core/xml/DOMParser.cpp

Index: Source/core/xml/DOMParser.cpp
diff --git a/Source/core/xml/DOMParser.cpp b/Source/core/xml/DOMParser.cpp
index a60572e2e5cfeace4f48d641b94b827eae2924dc..4e68739295b28a587ef20a905e48d303e134c628 100644
--- a/Source/core/xml/DOMParser.cpp
+++ b/Source/core/xml/DOMParser.cpp
@@ -27,9 +27,14 @@ namespace blink {
 
 PassRefPtrWillBeRawPtr<Document> DOMParser::parseFromString(const String& str, const String& type)
 {
-    RefPtrWillBeRawPtr<Document> doc = DOMImplementation::createDocument(type, 0, KURL(), false);
+    RefPtrWillBeRawPtr<Document> doc = DOMImplementation::createDocument(type, DocumentInit(KURL(), nullptr, m_contextDocument), false);
     doc->setContent(str);
     return doc.release();
 }
 
+DOMParser::DOMParser(Document& document)
+    : m_contextDocument(document.contextDocument())
+{
+}
+
 } // namespace blink