title: Electron how to focus browserwindow on receiving ipc message in a webview
body: <p>I'm using electron with multiple browserWindows.
  in this browserWindow I do have a webview where the content is shown.
  Now I wat to send a new url to the webview of the other open browserWindow.</p>
  
  <p>So I created a ipc listener in all of the browserwindows / webviews to update the url if a request is received. this is working fine so far.
  Only what I can't get working is to focus/show the window with the new url.</p>
  
  <p>I've tried to find a way to get the browserWindow instance for a webview, but that seems impossible... </p>
  
  <p>How can I show/focus a window on receiving a message via IPC?
  Thanks!</p>