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This change creates the basic structure of the 'Scan To' dropdown
responsible for choosing the directory to save completed scans. This
iteration will only have one option defaulted to the 'My files'
directory and the follow up CL will let the user choose the
directory through the select dialog.

'My files' needs to be created as separate string for displaying because
the underlying filepath is always "../../MyFiles".

Screenshot: http://screen/AZ6RRV9pPGUKEsN

Bug: 1059779
Change-Id: I3f6ebff75c9a81ca8ed13c8d8cd49f5346978cff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2503854
Auto-Submit: Gavin Williams <gavinwill@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Reviewed-by: Jimmy Gong <jimmyxgong@chromium.org>
Commit-Queue: Gavin Williams <gavinwill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822019}