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

third_party/WebKit/public/web/WebFrameOwnerProperties.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebFrameOwnerProperties_h
 #define WebFrameOwnerProperties_h
 
 #include "../platform/WebString.h"
 #include "../platform/WebVector.h"
 #include "../platform/modules/permissions/WebPermissionType.h"
 #include <algorithm>
 
 namespace blink {
 
 struct WebFrameOwnerProperties {
   enum class ScrollingMode { Auto, AlwaysOff, AlwaysOn, Last = AlwaysOn };
 
   WebString name;  // browsing context container's name
   ScrollingMode scrollingMode;
   int marginWidth;
   int marginHeight;
   bool allowFullscreen;
   bool allowPaymentRequest;
+  bool isDisplayNone;
   WebString requiredCsp;
   WebVector<WebPermissionType> delegatedPermissions;
 
   WebFrameOwnerProperties()
       : scrollingMode(ScrollingMode::Auto),
         marginWidth(-1),
         marginHeight(-1),
         allowFullscreen(false),
-        allowPaymentRequest(false) {}
+        allowPaymentRequest(false),
+        isDisplayNone(false) {}
 
 #if INSIDE_BLINK
   WebFrameOwnerProperties(
       const WebString& name,
       ScrollbarMode scrollingMode,
       int marginWidth,
       int marginHeight,
       bool allowFullscreen,
       bool allowPaymentRequest,
+      bool isDisplayNone,
       const WebString& requiredCsp,
       const WebVector<WebPermissionType>& delegatedPermissions)
       : name(name),
         scrollingMode(static_cast<ScrollingMode>(scrollingMode)),
         marginWidth(marginWidth),
         marginHeight(marginHeight),
         allowFullscreen(allowFullscreen),
         allowPaymentRequest(allowPaymentRequest),
+        isDisplayNone(isDisplayNone),
         requiredCsp(requiredCsp),
         delegatedPermissions(delegatedPermissions) {}
 #endif
 };
 
 }  // namespace blink
 
 #endif