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

third_party/WebKit/Source/web/RemoteFrameOwner.h

Index: third_party/WebKit/Source/web/RemoteFrameOwner.h
diff --git a/third_party/WebKit/Source/web/RemoteFrameOwner.h b/third_party/WebKit/Source/web/RemoteFrameOwner.h
index 4b553fd8e0a7bf78bec9c9691f8a2b3e8479a12c..4ff85e4630a4f9da3738a2c4f9bfb3dfe7fbcb55 100644
--- a/third_party/WebKit/Source/web/RemoteFrameOwner.h
+++ b/third_party/WebKit/Source/web/RemoteFrameOwner.h
@@ -47,6 +47,7 @@ class RemoteFrameOwner final
   int marginHeight() const override { return m_marginHeight; }
   bool allowFullscreen() const override { return m_allowFullscreen; }
   bool allowPaymentRequest() const override { return m_allowPaymentRequest; }
+  bool isDisplayNone() const override { return m_isDisplayNone; }
   AtomicString csp() const override { return m_csp; }
   const WebVector<mojom::blink::PermissionName>& delegatedPermissions()
       const override {
@@ -65,6 +66,7 @@ class RemoteFrameOwner final
   void setAllowPaymentRequest(bool allowPaymentRequest) {
     m_allowPaymentRequest = allowPaymentRequest;
   }
+  void setIsDisplayNone(bool isDisplayNone) { m_isDisplayNone = isDisplayNone; }
   void setCsp(const WebString& csp) { m_csp = csp; }
   void setDelegatedpermissions(
       const WebVector<mojom::blink::PermissionName>& delegatedPermissions) {
@@ -89,6 +91,7 @@ class RemoteFrameOwner final
   int m_marginHeight;
   bool m_allowFullscreen;
   bool m_allowPaymentRequest;
+  bool m_isDisplayNone;
   WebString m_csp;
   WebVector<mojom::blink::PermissionName> m_delegatedPermissions;
 };