This is useful for dumping live objects on exit, to debug resource leaks.

Change-Id: Ie88787defa37853d0a33c951b107ceac289e58df
Reviewed-on: https://chromium-review.googlesource.com/256461Reviewed-by: Brandon Jones <bajones@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>