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

third_party/WebKit/Source/core/layout/LayoutView.cpp

Index: third_party/WebKit/Source/core/layout/LayoutView.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutView.cpp b/third_party/WebKit/Source/core/layout/LayoutView.cpp
index 97b8fa5a79adac5aef54633c5b53d5df226b11b3..516bcb990e322e1089549d8e9053c139573879a5 100644
--- a/third_party/WebKit/Source/core/layout/LayoutView.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutView.cpp
@@ -21,6 +21,7 @@
 
 #include "core/layout/LayoutView.h"
 
+#include <inttypes.h>
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/editing/FrameSelection.h"
@@ -41,6 +42,7 @@
 #include "core/paint/ViewPainter.h"
 #include "core/svg/SVGDocumentExtensions.h"
 #include "platform/Histogram.h"
+#include "platform/RuntimeEnabledFeatures.h"
 #include "platform/geometry/FloatQuad.h"
 #include "platform/geometry/TransformState.h"
 #include "platform/graphics/paint/PaintController.h"
@@ -48,7 +50,6 @@
 #include "platform/instrumentation/tracing/TracedValue.h"
 #include "public/platform/Platform.h"
 #include "wtf/PtrUtil.h"
-#include <inttypes.h>
 
 namespace blink {
 
@@ -187,6 +188,15 @@ bool LayoutView::isChildAllowed(LayoutObject* child,
   return child->isBox();
 }
 
+bool LayoutView::canHaveChildren() const {
+  FrameOwner* owner = frame()->owner();
+  if (!owner)
+    return true;
+  if (!RuntimeEnabledFeatures::displayNoneIFrameCreatesNoLayoutObjectEnabled())
+    return true;
+  return !owner->isDisplayNone();
+}
+
 void LayoutView::layoutContent() {
   ASSERT(needsLayout());