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It turned out current physical key tracking does not work
if IME is enabled. It is not only for ARC, but also Lacros (as we
start using IME soon), and crostini in the future when IME is
fully enabled.

Currently, we have workaround for ARC, so Lacros follows the
approach for short term.
We need a long term fix in the future, though.

      if there is no composing text.

Bug: 1133651
Test: Typed cursor key on Lacros window. It works as expected
Change-Id: Ib709ea852ddbec75d4790cf3aabdf353cade089d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2452273
Commit-Queue: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Jun Mukai <mukai@chromium.org>
Reviewed-by: Yuichiro Hanada <yhanada@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815475}