- Electron version: v0.36.9
- Operating system: Windows 10/OS X

In #779 a `disposition` was added to the `new-window` event in [webContents](https://github.com/atom/electron/blob/master/docs/api/web-contents.md#event-new-window) but it always seems to be set to `new-window` when clicking on target="_blank" links in our web app wrapper: https://github.com/irccloud/irccloud-desktop/blob/v0.1.3/app/main.js#L109

If I Ctrl (Win) or Cmd (OS X) or middle click on links, I would expect to see a `background-tab` disposition, as in Chrome that will open links in a background tab, while keeping focus on the current tab. I'd like to catch this behaviour to set `activate` to false in `shell.openExternal`.

Is this possible?

atom/browser/api/atom_api_app.cc
else if (name == "documents")
    return chrome::DIR_USER_DOCUMENTS;
  else if (name == "downloads")
    return chrome::DIR_DEFAULT_DOWNLOADS;
  else if (name == "music")
    return chrome::DIR_USER_MUSIC;
  else if (name == "pictures")
    return chrome::DIR_USER_PICTURES;
  else if (name == "videos")
    return chrome::DIR_USER_VIDEOS;
  else
    return -1;
}
bool NotificationCallbackWrapper(
    const ProcessSingleton::NotificationCallback& callback,
    const base::CommandLine::StringVector& cmd,
    const base::FilePath& cwd) {
  
  if (Browser::Get()->is_ready()) {
    callback.Run(cmd, cwd);
  } else {
    scoped_refptr<base::SingleThreadTaskRunner> task_runner(
        base::ThreadTaskRunnerHandle::Get());
    task_runner->PostTask(
        FROM_HERE, base::Bind(base::IgnoreResult(callback), cmd, cwd));
  }
  
  return !Browser::Get()->is_shutting_down();
}
void OnClientCertificateSelected(