- provide structured output
- take deps_file fallback into account

Bug: 756474
Change-Id: Icb15eb9601b0aaf510300cf8992b067a25f6888a
Reviewed-on: https://chromium-review.googlesource.com/663258Reviewed-by: Michael Moss <mmoss@chromium.org>
Commit-Queue: Paweł Hajdan Jr. <phajdan.jr@chromium.org>