Allow MimeHandlerViewGuest be embedded inside OOPIFs

extensions/browser/guest_view/extensions_guest_view_message_filter.cc

 // 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.
 
 #include "extensions/browser/guest_view/extensions_guest_view_message_filter.h"
 
 #include "base/macros.h"
 #include "components/guest_view/browser/guest_view_base.h"
 #include "components/guest_view/browser/guest_view_manager.h"
 #include "components/guest_view/browser/guest_view_manager_delegate.h"
@@ skipping 151 matching lines @@
   auto* guest_view = MimeHandlerViewGuest::FromWebContents(web_contents);
   if (!guest_view)
     return;
 
   int guest_instance_id = guest_view->guest_instance_id();
   auto* rfh = RenderFrameHost::FromID(embedder_render_process_id,
                                       embedder_render_frame_id);
   if (!rfh)
     return;
 
+  guest_view->SetEmbedderFrame(embedder_render_process_id,
+                               embedder_render_frame_id);
+
   base::DictionaryValue attach_params;
   attach_params.SetInteger(guest_view::kElementWidth, element_size.width());
   attach_params.SetInteger(guest_view::kElementHeight, element_size.height());
   auto* manager = GuestViewManager::FromBrowserContext(browser_context_);
   CHECK(manager);
-  manager->AttachGuest(embedder_render_process_id,
-                       element_instance_id,
-                       guest_instance_id,
-                       attach_params);
+  manager->AttachGuest(embedder_render_process_id, element_instance_id,
+                       guest_instance_id, attach_params);
 
   rfh->Send(
       new ExtensionsGuestViewMsg_CreateMimeHandlerViewGuestACK(
           element_instance_id));
 }
 
 }  // namespace extensions