Infrastructure ('infra') refers to all of the servers and tools which the Chromium project depends on for development.

Most of these are maintained at Google by a dedicated team, but (almost) all of these are modifiable by anyone in the Chromium project.

To check out (most) of the Chromium Infra code use:
fetch infra

Join for discussion of Chromium infrastructure related issues.

Google employees can also find more information at the internal Chrome Infrastructure site.