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This barcode scanner (as with many others) works by pretending to be a
keyboard and typing out the barcodes it scans. This prevents the
on-screen keyboard from appearing on devices without an actual keyboard
plugged in.

Bug: 1004645, b:141515578
Test: check scanner works, and that VK appears when appropriate
Change-Id: I0e983035e645b412955bed38307de43ce5ab2ac5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2388347Reviewed-by: Michael Spang <spang@chromium.org>
Commit-Queue: Harry Cutts <hcutts@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804494}