[Reland #1] Don't create layout objects for children of display-none iframes.

third_party/WebKit/Source/core/frame/FrameOwner.h

Index: third_party/WebKit/Source/core/frame/FrameOwner.h
diff --git a/third_party/WebKit/Source/core/frame/FrameOwner.h b/third_party/WebKit/Source/core/frame/FrameOwner.h
index cbc074117b88ae1749fc7fb69074f2298ed401d5..9c3ec48c1308a30e4f62ffe1258040a78a24e438 100644
--- a/third_party/WebKit/Source/core/frame/FrameOwner.h
+++ b/third_party/WebKit/Source/core/frame/FrameOwner.h
@@ -49,6 +49,7 @@ class CORE_EXPORT FrameOwner : public GarbageCollectedMixin {
   virtual int marginHeight() const = 0;
   virtual bool allowFullscreen() const = 0;
   virtual bool allowPaymentRequest() const = 0;
+  virtual bool isDisplayNone() const = 0;
   virtual AtomicString csp() const = 0;
   virtual const WebVector<mojom::blink::PermissionName>& delegatedPermissions()
       const = 0;
@@ -84,6 +85,7 @@ class CORE_EXPORT DummyFrameOwner
   int marginHeight() const override { return -1; }
   bool allowFullscreen() const override { return false; }
   bool allowPaymentRequest() const override { return false; }
+  bool isDisplayNone() const override { return false; }
   AtomicString csp() const override { return nullAtom; }
   const WebVector<mojom::blink::PermissionName>& delegatedPermissions()
       const override {