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After crrev.com/c/2028408, keyboard input handling has been broken in
Ozone/X11 desktop builds (CrOS on Linux is not affected), when IBus IME
is setup, among other cases which depend on KeyEvents::Properties being
properly set. This fixes it as well as adds a unit test to prevent
future similar regressions.

Bug: 1047999
Change-Id: If67b78eb795b8d5efabf987a25ebf68de733948e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2034810
Commit-Queue: Nick Yamane <nickdiego@igalia.com>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738473}