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For each scan source reported by lorgnette, use its scannable area to
determine the page sizes it supports. Add these page sizes to each
ScanSource reported by ScanService.

Bug: 1059779
Change-Id: Id909260f2de8eeebf15d1d67776403c993b81c2b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2481742Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Jesse Schettler <jschettler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818964}