File: README.md

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KeyedService and KeyedServiceFactory together support building a dependency tree
of services that are all keyed off the same object (typically,
content::BrowserContext or web::BrowserState), and whose teardown order is
managed according to the expressed dependency order.

KeyedService is a
[layered component](https://crsrc.org/docs/website/site/developers/design-documents/layered-components-design/index.md)
to enable it to be shared cleanly on iOS.

This component has the following structure:

- core/: shared code that does not depend on src/content/ or src/ios/
- content/: Code based on the content layer.
- ios/: Code based on src/ios.

On Android, C++ keyed services often have a corresponding Java object. In such
cases, the C++ part should own the Java one. You can find more details in
docs/android_jni_ownership_best_practices.md.