Retry r27137. Create renderers for ExtensionHosts one at a time to avoid blocking the UI.

chrome/browser/renderer_host/render_view_host.cc

 // Copyright (c) 2009 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 "chrome/browser/renderer_host/render_view_host.h"
 
 #include <string>
 #include <vector>
 
 #include "app/l10n_util.h"
@@ skipping 185 matching lines @@
     renderer_process_handle = GetCurrentProcess();
 
   BOOL result = DuplicateHandle(GetCurrentProcess(),
       modal_dialog_event_->handle(),
       renderer_process_handle,
       &modal_dialog_event_handle,
       SYNCHRONIZE,
       FALSE,
       0);
   DCHECK(result) <<
-      "Couldn't duplicate the modal dialog handle for the renderer.";
+      "Couldn't duplicate the modal dialog handle for the renderer: " <<
+      GetLastError();
 #endif
 
   ModalDialogEvent modal_dialog_event;
 #if defined(OS_WIN)
   modal_dialog_event.event = modal_dialog_event_handle;
 #endif
 
   // Force local storage to be enabled for extensions. This is so that we can
   // enable extensions by default before databases, if necessary.
   // TODO(aa): This should be removed when local storage and databases are
@@ skipping 1476 matching lines @@
 }
 
 void RenderViewHost::ResetModalDialogEvent() {
   if (--modal_dialog_count_ == 0)
     modal_dialog_event_->Reset();
 }
 
 void RenderViewHost::UpdateBrowserWindowId(int window_id) {
   Send(new ViewMsg_UpdateBrowserWindowId(routing_id(), window_id));
 }