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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
content::Ws* source) {
  if (!dialog_manager_)
    dialog_manager_ = std::make_unique<ElectronJavaScriptDialogManager>(this);
  return dialog_manager_.get();
}
void Ws::OnAudioStateChanged(bool audible) {
  Emit("-audio-state-changed", audible);
}
void Ws::BeforeUnloadFired(bool proceed,
                                    const base::TimeTicks& proceed_time) {
  
  
}
void Ws::RenderViewCreated(content::RenderViewHost* render_view_host) {
  if (!background_throttling_)
    render_view_host->SetSchedulerThrottling(false);
}
void Ws::RenderFrameCreated(
    content::RenderFrameHost* render_frame_host) {
  auto* rwhv = render_frame_host->GetView();
  if (!rwhv)
    return;
  auto* rwh_impl =
      static_cast<content::RenderWidgetHostImpl*>(rwhv->GetRenderWidgetHost());
  if (rwh_impl)
    rwh_impl->disable_hidden_ = !background_throttling_;
}
void Ws::RenderViewHostChanged(content::RenderViewHost* old_host,