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 feb4de4ee696b062f5354d975258e64c6e3a27ee..1f9b6eb7b9aafb38209c4714a351a2b8c5b9e329 100644
--- a/third_party/WebKit/Source/web/RemoteFrameOwner.h
+++ b/third_party/WebKit/Source/web/RemoteFrameOwner.h
@@ -41,6 +41,7 @@ class RemoteFrameOwner final
   int marginWidth() const override { return m_marginWidth; }
   int marginHeight() const override { return m_marginHeight; }
   bool allowFullscreen() const override { return m_allowFullscreen; }
+  bool isDisplayNone() const override { return m_isDisplayNone; }
   AtomicString csp() const override { return m_csp; }
   const WebVector<WebPermissionType>& delegatedPermissions() const override {
     return m_delegatedPermissions;
@@ -52,6 +53,7 @@ class RemoteFrameOwner final
   void setAllowFullscreen(bool allowFullscreen) {
     m_allowFullscreen = allowFullscreen;
   }
+  void setIsDisplayNone(bool isDisplayNone) { m_isDisplayNone = isDisplayNone; }
   void setCsp(const WebString& csp) { m_csp = csp; }
   void setDelegatedpermissions(
       const WebVector<WebPermissionType>& delegatedPermissions) {
@@ -74,6 +76,7 @@ class RemoteFrameOwner final
   int m_marginWidth;
   int m_marginHeight;
   bool m_allowFullscreen;
+  bool m_isDisplayNone;
   WebString m_csp;
   WebVector<WebPermissionType> m_delegatedPermissions;
 };