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This is preparation to share XkbTracker with wayland IME server.

BUG=1123705
TEST=Built locally. Run exo_unittests.

Change-Id: I7859c2193578cc5a18fa39a96c3fe86d2f39f4dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2428505
Commit-Queue: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810863}