This is CPU profiler periodically collecting CPU usage of local process during Chrome build. This can be used to find build actions that may have low-hanging fruit for build performance optimization.
$ echo 'infra/tools/build_profiler/${platform} latest' > ensure_file.txt
$ cipd ensure -ensure-file ensure_file.txt -root dir
To run build_profiler, you need to prepend build_profiler for usual build command.
e.g.
$ build_profiler autoninja -C out/Release chrome