WIP: Give developers an opt-in mechanism to block some parser-inserted scripts.

third_party/WebKit/Source/core/html/HTMLIFrameElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Simon Hausmann (hausmann@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2006, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Ericsson AB. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 31 matching lines @@
 HTMLIFrameElement* HTMLIFrameElement::create(Document& document,
                                              bool createdByFragmentParser) {
   return new HTMLIFrameElement(document, createdByFragmentParser);
 }
 
 inline HTMLIFrameElement::HTMLIFrameElement(Document& document,
                                             bool createdByFragmentParser)
     : HTMLFrameElementBase(iframeTag, document),
       m_didLoadNonEmptyDocument(false),
       m_createdByFragmentParser(createdByFragmentParser),
+      m_createdByDocumentWrite(document.isInDocumentWrite()),
       m_sandbox(HTMLIFrameElementSandbox::create(this)),
       m_referrerPolicy(ReferrerPolicyDefault) {}
 
 DEFINE_TRACE(HTMLIFrameElement) {
   visitor->trace(m_sandbox);
   visitor->trace(m_permissions);
   HTMLFrameElementBase::trace(visitor);
   Supplementable<HTMLIFrameElement>::trace(visitor);
 }
 
@@ skipping 164 matching lines @@
 bool HTMLIFrameElement::initializePermissionsAttribute() {
   if (!RuntimeEnabledFeatures::permissionDelegationEnabled())
     return false;
 
   if (!m_permissions)
     m_permissions = HTMLIFrameElementPermissions::create(this);
   return true;
 }
 
 }  // namespace blink