### Preflight Checklist

- [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](https://www.github.com/electron/electron/issues) for a feature request that matches the one I want to file, without success.

### Problem Description

We need to load a custom error page when the certificate is invalid but without "isMainFrame" property we don't know when to load the custom error page using webContents.loadURL()

### Proposed Solution

webContents.on("certificate-error", ((event, url, error, certificate, callback, isMainFrame)

### Alternatives Considered

Not sure

### Additional Information

Not sure
shell/browser/api/electron_api_app.cc
v8::Local<v8::Value> val,
                     JumpListCategory* out) {
    gin_helper::Dictionary dict;
    if (!ConvertFromV8(isolate, val, &dict))
      return false;
    if (dict.Get("name", &(out->name)) && out->name.empty())
      return false;
    if (!dict.Get("type", &(out->type))) {
      if (out->name.empty())
        out->type = JumpListCategory::Type::kTasks;
      else
        out->type = JumpListCategory::Type::kCustom;
    }
    if ((out->type == JumpListCategory::Type::kTasks) ||
        (out->type == JumpListCategory::Type::kCustom)) {
      if (!dict.Get("items", &(out->items)))
        return false;
    }
    return true;
  }
};
template <>
struct Converter<JumpListResult> {
  static v8::Local<v8::Value> ToV8(v8::Isolate* isolate, JumpListResult val) {