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This change adds a option to the Scan To dropdown that opens the select
dialog and lets the user choose the directory to save completed scans.

Screenshot: http://screen/dnTcAPoV48BZmDJ

Bug: 1059779
Change-Id: Id35ed06fff8fe1f4ca4c3e0c8c6d5ace852ea750
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2508151
Commit-Queue: Gavin Williams <gavinwill@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Jimmy Gong <jimmyxgong@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822926}