GitLab

Add a new Polymer element, scanner-select, to display connected scanners
in a dropdown. Styling and finalized strings will be added in subsequent
CLs.

Bug: 1059779
Change-Id: Ia913879262441094c7f7362b648f990943fde907
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2378138
Commit-Queue: Jesse Schettler <jschettler@chromium.org>
Reviewed-by: Jimmy Gong <jimmyxgong@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805505}