User Education
User Education in Chrome is designed to introduce users to new and existing features with which they might not be familiar.
The user education system provides a common UX for nudging users towards these features, including full, user-initiated tutorials.
If you want to understand the architecture of the User Education subsystem, including its various configuration classes, read this document.
If you'd like to just dive in and start implementing User Education UX for your application or platform of choice, instructions are provided here.