* 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!
brightray/browser/notification.h
#ifndef BRIGHTRAY_BROWSER_NOTIFICATION_H_
#define BRIGHTRAY_BROWSER_NOTIFICATION_H_
#include <string>
#include <vector>
#include "base/memory/weak_ptr.h"
#include "base/strings/string16.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "url/gurl.h"
namespace brightray {
class NotificationDelegate;
class NotificationPresenter;
struct NotificationAction {
  base::string16 type;
  base::string16 text;
};
struct NotificationOptions {
  base::string16 title;
  base::string16 subtitle;
  base::string16 msg;
  std::string tag;
  GURL icon_url;
  SkBitmap icon;
  bool silent;
  bool has_reply;
  base::string16 reply_placeholder;
  base::string16 sound;
  std::vector<NotificationAction> actions;
};
class Notification {