Potential changes to cookies in Chrome. - Google Groups
groups.google.com/a/chromium.org/forum/m/#!topic/security-dev/2PK3q_VE1rg
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Cookies are a bit of a rough edge on the web's security model. They don't respect the same origin policy, and the disconnect between their persistence model and that of the rest of the platform causes no end of teeth-gnashing and hair-pulling among developers and auditors alike. We're planning a few changes to bring things into something more closely resembling alignment.