Expose API for managing Web App aspects

[marcoscaceres]

It would be nice to have some kind of API for inspecting, and perhaps updating, aspects relating to the web application: that is, an API that reflects the values of the manifest - or perhaps even allows the manifest to not exist at all.

Ideally, this API would live in a service worker - and would act as the "source of truth" for the web application. The current manifest format could serve as way of populating the web app's defaults - but those could be access and updated via this API.

One could then access things like the start_url, the icons, etc.

@annevk, would you like to elaborate on some use case, ideas, model, etc.?

[marcoscaceres]

Closing as won't fix for now... sticking to JSON format. No plans to add an API at this point.