Credential Management is newly ratified (or will be ratified soon I lose track at this point. Mike West works fast). Either way, the api is exposed to chrome.
The best I can understand is that Google and Apple both want to store your passwords in the browser/keyring, and sync them between your devices. Apple has begun "suggesting" passwords in Safari that are fairly strong.
It's scary to think about, but "browser" is already the most used "password manager". It just is not full featured yet.
* you are using chrome