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Add and implement ScanService::Scan() to allow clients to perform scans.
The ScanService currently saves each scanned image to the user's
"My files" folder, but future changes will allow clients to specify the
file type and save-to location.

Bug: 1059779
Change-Id: I628571f8663498bc8499e9b7e53d1d6b144a0816
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2436385
Commit-Queue: Jesse Schettler <jschettler@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813480}