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The interface allows classes outside of ash/ to observe any bounds
changes of ARC IME window.
This CL should not cause any behavior change.

Bug: 1060272
Change-Id: I3b5b0652c89fd87ffe93de4903dae11523b30dae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2217827
Commit-Queue: Yuichiro Hanada <yhanada@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772651}