GitLab

Implement conversion from PNG to JPG image format when requested by user
on scanning UI. Add unit tests to verify functionality.

Bug: b:161237869
Change-Id: I8d21a0d7ddff0ddb3635b45b133f3869ec3e61cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2507574
Commit-Queue: Kyra Moed <kmoed@google.com>
Reviewed-by: Jesse Schettler <jschettler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823330}