We use the following groups for high technical content discussions about implementation details within Chromium. The intended audience is engineers contributing code to Chromium.

These groups are not the right place to post feature requests, help/support queries, or other end user questions!

For that, see the Google Chrome Help Center or general discussion groups.

chromium-dev

The engineering (developer) team uses this to discuss technical issues and for announcements. This is a moderate volume, high technical content mailing list. Topical posts include items such as plans to reduce memory consumption, discussion around how certain code areas are implemented and how to extend or improve such code, announcements of new tests being added to the buildbots, and so forth. 

chromium-reviews

The engineering (developer) team uses this to conduct code reviews of changes to the Chromium source. This is a high volume, high technical content mailing list. Topical posts are strictly limited to code reviews. All email threads on this list originate from code reviews. Please do not start new threads on this list.

chromium-checkins

This is a read-only list that can be used to monitor individual checkins to the Chromium source. This is a high volume, high technical content mailing list. All emails to this list are automatically generated when code is checked in. Please do not send emails to this list.

chromium-bugs

This is a read-only list that contains all of the bug database email traffic. All email threads originate from bugs opened in the bug database. Please do not create new threads on this list.