Don't create layout objects for children of display-none iframes.

third_party/WebKit/Source/core/dom/Element.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003-2011, 2013, 2014 Apple Inc. 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
  * License as published by the Free Software Foundation; either
@@ skipping 143 matching lines @@
   int getIntegralAttribute(const QualifiedName& attributeName) const;
   void setIntegralAttribute(const QualifiedName& attributeName, int value);
   void setUnsignedIntegralAttribute(const QualifiedName& attributeName,
                                     unsigned value);
   double getFloatingPointAttribute(
       const QualifiedName& attributeName,
       double fallbackValue = std::numeric_limits<double>::quiet_NaN()) const;
   void setFloatingPointAttribute(const QualifiedName& attributeName,
                                  double value);
 
+  // TODO: This is the wrong approach, but gets the job done. Find a more
+  // appropriate way of doing the same thing.
+  bool forceReattachDuringStyleRecalc() {
+    bool r = m_forceReattach;
+    m_forceReattach = false;

[esprehn, 2016/12/10 02:20:55]

You don't need any of this. lazyReattach does the same thing.

+    return r;
+  }
+  void setForceReattach() { m_forceReattach = true; }
+  bool m_forceReattach = false;
+
   // Call this to get the value of an attribute that is known not to be the
   // style attribute or one of the SVG animatable attributes.
   bool fastHasAttribute(const QualifiedName&) const;
   const AtomicString& fastGetAttribute(const QualifiedName&) const;
 #if DCHECK_IS_ON()
   bool fastAttributeLookupAllowed(const QualifiedName&) const;
 #endif
 
 #ifdef DUMP_NODE_STATISTICS
   bool hasNamedNodeMap() const;
@@ skipping 1000 matching lines @@
 #define DECLARE_ELEMENT_FACTORY_WITH_TAGNAME(T) \
   static T* create(const QualifiedName&, Document&)
 #define DEFINE_ELEMENT_FACTORY_WITH_TAGNAME(T)                     \
   T* T::create(const QualifiedName& tagName, Document& document) { \
     return new T(tagName, document);                               \
   }
 
 }  // namespace blink
 
 #endif  // Element_h