[Reland #1] Don't create layout objects for children of display-none iframes.

content/common/frame_owner_properties.h

 // Copyright 2016 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 CONTENT_COMMON_FRAME_OWNER_PROPERTIES_H_
 #define CONTENT_COMMON_FRAME_OWNER_PROPERTIES_H_
 
 #include <vector>
 
 #include "content/common/content_export.h"
@@ skipping 15 matching lines @@
   bool operator!=(const FrameOwnerProperties& other) const {
     return !(*this == other);
   }
 
   std::string name;  // browsing context container's name
   blink::WebFrameOwnerProperties::ScrollingMode scrolling_mode;
   int margin_width;
   int margin_height;
   bool allow_fullscreen;
   bool allow_payment_request;
+  bool is_display_none;
 
   // An experimental attribute to be used by a parent frame to enforce CSP on a
   // subframe. This is different from replicated CSP headers kept in
   // FrameReplicationState that keep track of CSP headers currently in effect
   // for a frame. See https://crbug.com/647588 and
   // https://www.w3.org/TR/csp-embedded-enforcement/#required-csp
   std::string required_csp;
 
   std::vector<blink::mojom::PermissionName> delegated_permissions;
   std::vector<blink::WebFeaturePolicyFeature> allowed_features;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_FRAME_OWNER_PROPERTIES_H_