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

content/common/frame_messages.h

 // Copyright 2013 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.
 
 // IPC messages for interacting with frames.
 // Multiply-included message file, hence no include guard.
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 158 matching lines @@
   IPC_STRUCT_TRAITS_MEMBER(link_followed)
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_TRAITS_BEGIN(content::FrameOwnerProperties)
   IPC_STRUCT_TRAITS_MEMBER(name)
   IPC_STRUCT_TRAITS_MEMBER(scrolling_mode)
   IPC_STRUCT_TRAITS_MEMBER(margin_width)
   IPC_STRUCT_TRAITS_MEMBER(margin_height)
   IPC_STRUCT_TRAITS_MEMBER(allow_fullscreen)
   IPC_STRUCT_TRAITS_MEMBER(allow_payment_request)
+  IPC_STRUCT_TRAITS_MEMBER(is_display_none)

[dcheng, 2017/02/05 09:56:08]

Currently this is passed via IPC, but isn't actually replicated. Will a followup
patch implement the browser-side replication?

[erikchen, 2017/02/10 17:19:30]

I believe this CL correctly passes is_display_none state [and there are tests
that pass that should fail if it weren't]. Perhaps we could discuss more
offline? 

   IPC_STRUCT_TRAITS_MEMBER(required_csp)
   IPC_STRUCT_TRAITS_MEMBER(delegated_permissions)
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_TRAITS_BEGIN(content::PageImportanceSignals)
   IPC_STRUCT_TRAITS_MEMBER(had_form_interaction)
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_BEGIN(FrameHostMsg_DidFailProvisionalLoadWithError_Params)
   // Error code as reported in the DidFailProvisionalLoad callback.
@@ skipping 1374 matching lines @@
 // nearest find result in the sending frame.
 IPC_MESSAGE_ROUTED2(FrameHostMsg_GetNearestFindResult_Reply,
                     int /* nfr_request_id */,
                     float /* distance */)
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent FrameMsg, then ifdefs for platform specific FrameMsg, then
 // platform independent FrameHostMsg, then ifdefs for platform specific
 // FrameHostMsg.