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

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

Index: third_party/WebKit/Source/core/html/HTMLFrameOwnerElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLFrameOwnerElement.cpp b/third_party/WebKit/Source/core/html/HTMLFrameOwnerElement.cpp
index cebcc0b20d7aba39bb64b8c0c9697deed0f4a954..4a14fb6aa99a73559411cc5c436b6f10cf3775a3 100644
--- a/third_party/WebKit/Source/core/html/HTMLFrameOwnerElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLFrameOwnerElement.cpp
@@ -221,6 +221,13 @@ void HTMLFrameOwnerElement::disposeWidgetSoon(Widget* widget) {
   widget->dispose();
 }
 
+void HTMLFrameOwnerElement::frameOwnerPropertiesChanged() {
+  // Don't notify about updates if contentFrame() is null, for example when
+  // the subframe hasn't been created yet.
+  if (contentFrame())
+    document().frame()->loader().client()->didChangeFrameOwnerProperties(this);
+}
+
 void HTMLFrameOwnerElement::dispatchLoad() {
   dispatchScopedEvent(Event::create(EventTypeNames::load));
 }
@@ -231,6 +238,15 @@ HTMLFrameOwnerElement::delegatedPermissions() const {
   return permissions;
 }
 
+void HTMLFrameOwnerElement::setLayoutObject(LayoutObject* layoutObject) {
+  bool isDisplayNonePrev = isDisplayNone();
+  HTMLElement::setLayoutObject(layoutObject);
+  bool isDisplayNoneNew = isDisplayNone();
+  if (isDisplayNonePrev != isDisplayNoneNew) {
+    frameOwnerPropertiesChanged();
+  }
+}
+
 Document* HTMLFrameOwnerElement::getSVGDocument(
     ExceptionState& exceptionState) const {
   Document* doc = contentDocument();