- Bots use
mb
tool, which is actually a "thin" python script that stands for "Meta-Build wrapper". Detailed docs here. - Chromium builder configurations live at //tools/mb/mb_config.pyl file.
In order to find out, for example, the GN args used to build the official binaries of Lacros Chrome for amd64-generic
boards, look for the builder group and builder name and pass them in to mb.py lookup
scrip, as follows:
$ tools/mb/mb.py lookup --quiet -m tryserver.chrome -b lacros-amd64-generic-chrome