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

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

Index: third_party/WebKit/Source/core/dom/Element.h
diff --git a/third_party/WebKit/Source/core/dom/Element.h b/third_party/WebKit/Source/core/dom/Element.h
index 3733b523b04a9678c891dad2714e5d71758c92cb..51e4cf640bd4f30cdcc9510a24a0637d51fae500 100644
--- a/third_party/WebKit/Source/core/dom/Element.h
+++ b/third_party/WebKit/Source/core/dom/Element.h
@@ -161,6 +161,16 @@ class CORE_EXPORT Element : public ContainerNode {
   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;