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The toast will pop up and show for 5 seconds or be removed immediately
if the scan button is clicked again.

http://screen/9bUx9VbiapdgKrC

Bug: 1059779
Change-Id: Ifc0b44f79920b0f2daa167a5355ecdf9e1500b6e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2559254
Commit-Queue: Gavin Williams <gavinwill@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831207}