Now in the Chrome Web Store, developers can create "apps" that group together multiple privilege requests for a single site. Apps have a lightweight installation step that displays the privileges the app requests all together. Once an app is installed, it can use the privileges it requested during the installation process without any further nagging."
"Some privileges are relatively low-risk, so we infer permission to use them from the act of installing app. An example is notifications API, which's not allowed to normal web sites, as it could be used annoyingly. When a user installs an app, we interpret that as a sign of at least some trust, and allow that app to use Notifications API without additional prompting. If users don't like notifications, they can either disable them in the app's notification UI or they can simply uninstall the app.
This version, support permission request declarations for the geolocation, notifications, and unlimited storage privileges," explains Google.
More Info: Documentation