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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
gfx::Size size;
  bool stay_hidden = false;
  // get size arguments if they exist
  args->GetNext(&size);
  // get stayHidden arguments if they exist
  args->GetNext(&stay_hidden);
  ontents()->IncrementCapturerCount(size, stay_hidden);
}
void Ws::DecrementCapturerCount(gin_helper::Arguments* args) {
  bool stay_hidden = false;
  // get stayHidden arguments if they exist
  args->GetNext(&stay_hidden);
  ontents()->DecrementCapturerCount(stay_hidden);
}
bool Ws::IsBeingCaptured() {
  return ontents()->IsBeingCaptured();
}
void Ws::OnCursorChange(const content::WebCursor& cursor) {
  const content::CursorInfo& info = cursor.info();
  if (info.type == ui::CursorType::kCustom) {
    Emit("cursor-changed", CursorTypeToString(info),
         gfx::Image::CreateFrom1xBitmap(info.custom_image),
         info.image_scale_factor,
         gfx::Size(info.custom_image.width(), info.custom_image.height()),
         info.hotspot);
  } else {
    Emit("cursor-changed", CursorTypeToString(info));
  }
}
bool Ws::IsGuest() const {