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Add a scan button to the scanning app. When the button is clicked, use
the ScanService to perform a scan with the selected scanner and
settings.

Bug: 1059779
Change-Id: I52231a5a49fa01a2b56e42bcf2f9842fdf54ddf1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2437103
Auto-Submit: Jesse Schettler <jschettler@chromium.org>
Reviewed-by: Jimmy Gong <jimmyxgong@chromium.org>
Commit-Queue: Jesse Schettler <jschettler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814535}