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Add a new FileType enum and include it in ScanSettings. The file type
will be used to save scanned images in the desired format.

Tbr: dcheng@chromium.org
Bug: 1059779
Change-Id: I114ee2e85582340c46b4ab2111411b0ba2c16813
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2460980
Commit-Queue: Jesse Schettler <jschettler@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817320}