svoid startChromeAppWithWindowBounds(S url, Rect bounds) {
  if (bounds == null) ret with startChromeApp(url);
  File f = createTempFileWithExtension(".html");
  saveTextFile(f, hjavascript(
    javascript_setWindowBounds(bounds) + "\n"
      + "window.location=" + jsQuote(url) + ";"));
  startChromeApp(f);
}