<webview>: Make contentWindow available prior to attachment (on display:none).

extensions/browser/guest_view/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/guest_view_message_filter.h"
 
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "extensions/browser/guest_view/guest_view_base.h"
@@ skipping 22 matching lines @@
 GuestViewMessageFilter::~GuestViewMessageFilter() {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 }
 
 void GuestViewMessageFilter::OverrideThreadForMessage(
     const IPC::Message& message,
     BrowserThread::ID* thread) {
   switch (message.type()) {
     case GuestViewHostMsg_AttachGuest::ID:
     case GuestViewHostMsg_CreateMimeHandlerViewGuest::ID:
-      *thread = BrowserThread::UI;
-      break;
     case GuestViewHostMsg_ResizeGuest::ID:
       *thread = BrowserThread::UI;
       break;
     default:
       break;
   }
 }
 
 void GuestViewMessageFilter::OnDestruct() const {
   // Destroy the filter on the IO thread since that's where its weak pointers
@@ skipping 106 matching lines @@
   manager->AttachGuest(embedder_render_process_id,
                        element_instance_id,
                        guest_instance_id,
                        attach_params);
 
   rfh->Send(
       new GuestViewMsg_CreateMimeHandlerViewGuestACK(element_instance_id));
 }
 
 }  // namespace extensions