Make DOMParser create documents with a context document set

Source/core/xml/DOMParser.cpp

 /*
  *  Copyright (C) 2003, 2006, 2008 Apple Inc. All rights reserved.
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  *  Lesser General Public License for more details.
  *
  *  You should have received a copy of the GNU Lesser General Public
  *  License along with this library; if not, write to the Free Software
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
 #include "config.h"
 #include "core/xml/DOMParser.h"
 
 #include "core/dom/DOMImplementation.h"
 #include "core/dom/ExceptionCode.h"
 #include "wtf/text/WTFString.h"
 
 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);

[haraken, 2015/02/11 08:23:11]

What happens if m_contextDocument is already cleared out at this point?

[Jens Widell, 2015/02/11 08:29:07]

Same thing as before, i.e. we crash if we parse a marquee element. We could
disable parseFromString() then, but I'm not sure that's a good thing.

We could also just disable the private JS compilation in HTMLMarqueeElement() if
there's no context document (or remove it entirely?). AFAICT the private JS is
compiled if any attribute is accessed on the element instead then, and thus
things still work.

     doc->setContent(str);
     return doc.release();
 }
 
+DOMParser::DOMParser(Document& document)
+    : m_contextDocument(document.contextDocument())
+{
+}
+
 } // namespace blink