Print result returned by compare_files.

No differences on dependencies are shown with commit
https://crrev.com/29b5fd95fd5f5b1e815cca5ef12c596a4e609620.
That is because the code did not print difference at all.
Let me print it if exists.

Also, shows number of deps.

BUG=314403

Review-Url: https://codereview.chromium.org/2293383005
Cr-Commit-Position: refs/heads/master@{#415947}
1 file changed