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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
Emit("activate");
}
void Ws::UpdateTargetURL(content::Ws* source,
                                  const GURL& url) {
  Emit("update-target-url", url);
}
bool Ws::HandleKeyboardEvent(
    content::Ws* source,
    const content::NativeWebKeyboardEvent& event) {
  if (type_ == Type::WEB_VIEW && embedder_) {
    
    return embedder_->HandleKeyboardEvent(source, event);
  } else {
    
    return CommonWsDelegate::HandleKeyboardEvent(source, event);
  }
}
content::KeyboardEventProcessingResult Ws::PreHandleKeyboardEvent(
    content::Ws* source,
    const content::NativeWebKeyboardEvent& event) {
  if (event.GetType() == blink::WebInputEvent::Type::kRawKeyDown ||
      event.GetType() == blink::WebInputEvent::Type::kKeyUp) {
    bool prevent_default = Emit("before-input-event", event);
    if (prevent_default) {
      return content::KeyboardEventProcessingResult::HANDLED;
    }
  }
  return content::KeyboardEventProcessingResult::NOT_HANDLED;
}
void Ws::ContentsZoomChange(bool zoom_in) {