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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
const GURL& target_url,
    const content::Referrer& referrer,
    const std::string& frame_name,
    WindowOpenDisposition disposition,
    const std::vector<std::string>& features,
    const scoped_refptr<network::ResourceRequestBody>& body) {
  if (type_ == Type::BROWSER_WINDOW || type_ == Type::OFF_SCREEN)
    Emit("-new-window", target_url, frame_name, disposition, features, body,
         referrer);
  else
    Emit("new-window", target_url, frame_name, disposition, features);
}
void Ws::WsCreated(content::Ws* source_contents,
                                     int opener_render_process_id,
                                     int opener_render_frame_id,
                                     const std::string& frame_name,
                                     const GURL& target_url,
                                     content::Ws* new_contents) {
  ChildWsTracker::CreateForWs(new_contents);
  auto* tracker = ChildWsTracker::FromWs(new_contents);
  tracker->url = target_url;
  tracker->frame_name = frame_name;
}
void Ws::AddNewContents(