* Electron version: 1.7.10
* Operating system: MacOS

### How to reproduce

Currently I am using a separate module for Mac notifications with action buttons (node-notifier). Action buttons are necessary for such scenarios: when user has incoming call, notification has two buttons: 'answer' and 'decline'. 
Recently I found out that Electron has its own implementation of notifications and allows to add action buttons. That's great feature, but the issue I found is that I can't add two actions. I see two possible solutions: add ability to change 'close' label or add ability to display several actions (e.g. under 'More' button, as it is implemented in Chrome).

Is there any plans to implement it? Thank you!
atom/browser/api/atom_api_notification.cc
return subtitle_;
}
base::string16 Notification::GetBody() const {
  return body_;
}
bool Notification::GetSilent() const {
  return silent_;
}
base::string16 Notification::GetReplyPlaceholder() const {
  return reply_placeholder_;
}
bool Notification::GetHasReply() const {
  return has_reply_;
}
std::vector<brightray::NotificationAction> Notification::GetActions() const {
  return actions_;
}
base::string16 Notification::GetSound() const {
  return sound_;
}
void Notification::SetTitle(const base::string16& new_title) {
  title_ = new_title;
}
void Notification::SetSubtitle(const base::string16& new_subtitle) {
  subtitle_ = new_subtitle;
}
void Notification::SetBody(const base::string16& new_body) {
  body_ = new_body;
}
void Notification::SetSilent(bool new_silent) {