How Do we find what level of Android protection is required for a specific permission.

Lets say we have `android.permission.SET_ACTIVITY_WATCHER`([docs](http://developer.android.com/reference/android/Manifest.permission.html#SET_ACTIVITY_WATCHER))

What protection level does it fall into?([docs](http://developer.android.com/guide/topics/manifest/permission-element.html))

* Regular
* Dangerous
* System or Signed
* Signed