client/common_lib/cros/chrome.py currently does in its Chrome.__init__:
        # Turn on collection of Chrome coredumps via creation of a magic file.
        # (Without this, Chrome coredumps are trashed.)
        open(constants.CHROME_CORE_MAGIC_FILE, 'w').close()

which is fine.  unfortunately, there is no cleanup phase which removes that knob.  so anyone who runs a related autotest will have this flag set and Chrome crashes can easily fill up a system with hundreds of MB if not GB, and since it's a test image, the crashes don't get uploaded/reaped.

see  issue 881638  for an example.

this behavior was last updated in  issue 485379  (https://chromium-review.googlesource.com/269808).