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Currently, when Switch Access captures a switch, it doesn't care which device it comes from. For example, if you have a Bluetooth switch that emulates keyboard keys '1' and '3', those keys will also be intercepted for Switch Access from your built-in Chromebook keyboard. Ideally, we would be able to distinguish between keys depending on the device they come from. Structural code in place at crrev.com/c/2613009.

Before: https://screenshot.googleplex.com/7StUsjssf5XqmzG
After: https://screenshot.googleplex.com/4EhHjsYdJUqBQ4G

Fixed: 1163371
AX-Relnotes: N/A.
Change-Id: I610e25bd9057db2ecb7b470e3990ef4a27c0444b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2610992
Commit-Queue: Josiah Krutz <josiahk@google.com>
Reviewed-by: Josiah Krutz <josiahk@google.com>
Reviewed-by: Jimmy Gong <jimmyxgong@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841708}