Extract the contents of RAR files and report hashes and signatures

Bug: 909778
Change-Id: Id1f5cb828b8ad5cc13dcff571e026dd69b3fbc76
Reviewed-on: https://chromium-review.googlesource.com/c/1327238
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615291}
19 files changed