Chrome Infrastructure is responsible for repositories, code review, building and testing of Chromium and related projects.
If you want to contribute to the Chromium browser, you're in the wrong place. See http://dev.chromium.org/getting-involved instead.
See targeted user or chrome-infra developer documentation.
If you cannot find what you're looking for here, take a look at our old wiki and feel free to ask questions on infra-dev@chromium.org.