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

third_party/WebKit/Source/web/FrameLoaderClientImpl.h

 /*
  * Copyright (C) 2009, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 168 matching lines @@
   void frameFocused() const override;
   void didChangeName(const String& name, const String& uniqueName) override;
   void didEnforceInsecureRequestPolicy(WebInsecureRequestPolicy) override;
   void didUpdateToUniqueOrigin() override;
   void didChangeSandboxFlags(Frame* childFrame, SandboxFlags) override;
   void didSetFeaturePolicyHeader(
       const WebParsedFeaturePolicyHeader& parsedHeader) override;
   void didAddContentSecurityPolicy(const String& headerValue,
                                    ContentSecurityPolicyHeaderType,
                                    ContentSecurityPolicyHeaderSource) override;
-  void didChangeFrameOwnerProperties(HTMLFrameElementBase*) override;
+  void didChangeFrameOwnerProperties(HTMLFrameOwnerElement*) override;
 
   void dispatchWillStartUsingPeerConnectionHandler(
       WebRTCPeerConnectionHandler*) override;
 
   bool allowWebGL(bool enabledPerSettings) override;
 
   void dispatchWillInsertBody() override;
 
   std::unique_ptr<WebServiceWorkerProvider> createServiceWorkerProvider()
       override;
@@ skipping 36 matching lines @@
 
 DEFINE_TYPE_CASTS(FrameLoaderClientImpl,
                   FrameLoaderClient,
                   client,
                   client->isFrameLoaderClientImpl(),
                   client.isFrameLoaderClientImpl());
 
 }  // namespace blink
 
 #endif