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This addresses a bug in Switch Access (go/cros-switch) where users got
stuck in editable text fields. The root cause was that the physical key
events were perceived to be virtual key events by the Switch Access
event handler. The solution is to more precisely identify which key
events come from physical devices.

Bug: 996893
Change-Id: Id39130ce7edc7f933c1be43f434b5a08f909f19f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1804395
Commit-Queue: Anastasia Helfinstein <anastasi@google.com>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699053}