Add a handler to DM to print out what was running when we crash.

This is an experiment to see if we can use something like this
rather than today's extremely verbose logging.

Now, hopefully something crashes.

BUG=skia:4978
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1725543002

Review URL: https://codereview.chromium.org/1725543002
1 file changed