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### Preflight Checklist
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* [x] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
* [x] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
* [x] I have searched the issue tracker for a feature request that matches the one I want to file, without success.

### Problem Description
<!-- Is your feature request related to a problem? Please add a clear and concise description of what the problem is. -->

They is no way to choose the paper format (A4, A3, Letter, ...) when printing with `webContents.print()`.

### Proposed Solution
<!-- Describe the solution you'd like in a clear and concise manner -->

Add something like the `pageSize` option which is available in [`webContents.printToPDF()`](https://electronjs.org/docs/api/web-contents#contentsprinttopdfoptions-callback).

shell/browser/api/electron_api_web_contents.cc
managed_ontents()->AttachTo(agent_host);
      break;
    }
  }
}
void Ws::SetIgnoreMenuShortcuts(bool ignore) {
  auto* web_preferences = WsPreferences::From(ontents());
  DCHECK(web_preferences);
  web_preferences->preference()->SetKey("ignoreMenuShortcuts",
                                        base::Value(ignore));
}
void Ws::SetAudioMuted(bool muted) {
  ontents()->SetAudioMuted(muted);
}
bool Ws::IsAudioMuted() {
  return ontents()->IsAudioMuted();
}
bool Ws::IsCurrentlyAudible() {
  return ontents()->IsCurrentlyAudible();
}
#if BUILDFLAG(ENABLE_PRINTING)
void Ws::OnGetDefaultPrinter(
    base::Value print_settings,
    printing::CompletionCallback print_callback,
    base::string16 device_name,
    bool silent,
    base::string16 default_printer) {
  base::string16 printer_name =
      device_name.empty() ? default_printer : device_name;
  print_settings.SetStringKey(printing::kSettingDeviceName, printer_name);