GitLab

The backend team has asked that we send the total count of files and
directories within archives. This CL adds this information to the
download ping for RAR archives.

Bug: 926586
Change-Id: Id24838c5984a72740ff3776dd26ef49965113d7b
Reviewed-on: https://chromium-review.googlesource.com/c/1487193Reviewed-by: Varun Khaneja <vakh@chromium.org>
Commit-Queue: Varun Khaneja <vakh@chromium.org>
Auto-Submit: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635629}