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 a724b55abf49e587f18470a8279df53f4531f446..b2cfd3ee958e657eb9ed4a6aa5a34165498fc0d2 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<WebPermissionType>& delegatedPermissions() const override {
     return m_delegatedPermissions;
@@ -64,6 +65,7 @@ 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<WebPermissionType>& delegatedPermissions) {
@@ -88,6 +90,7 @@ class RemoteFrameOwner final
   int m_marginHeight;
   bool m_allowFullscreen;
   bool m_allowPaymentRequest;
+  bool m_isDisplayNone;
   WebString m_csp;
   WebVector<WebPermissionType> m_delegatedPermissions;
 };