Definitions of LUCI entities for the chromium project.

The following subprojects exist:

• chromium - Builders that test the chromium/src codebase.
• codesearch - Builders that test codesearch with chromium.
• findit - Builders that are used by the Sheriff-o-Matic findit service.
• reclient - Builders that test the use of reclient by chromium builders.
• webrtc - Builders that test the integration of WebRTC with chromium.

Each subproject contains a subproject.star that is the entry point for its configuration, which execs the starlark files that define the LUCI entities for the subproject.