Chrome provides many special-purpose APIs like
to packaged apps.
Here are the supported chrome.* APIs:
Chrome also has experimental APIs, some of which will become supported APIs in future releases of Chrome.
Unless the doc says otherwise, methods in the chrome.* APIs are asynchronous: they return immediately, without waiting for the operation to finish. If you need to know the outcome of an operation, then you pass a callback function into the method. For more information, watch this video: