Log free space on device (df -h) if log=debug. Bug: chromium:1405504 Change-Id: I4c4f2e291bf10669b55adcd08bc57e338ca8ae62 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4147388 Reviewed-by: Yuly Novikov <ynovikov@chromium.org> Commit-Queue: Roman Lavrov <romanl@google.com>