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The root cause of this issue is that there is a wrong assumption in
current TSF implementations for JPN IMEs. IMEs may start new
composition at offset prior to current composition. We should not
commit current composition if the start of new composition is before
current composition. This change also fix an issue in Confirm/cancel
composition scenario. We should notify text change for the whole buffer
to let IME to terminate composition.

Bug: 944004
Change-Id: Iff8759481bfcb2da622483dabecfb6cc4c50da7f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1536637
Commit-Queue: Siye Liu <siliu@microsoft.com>
Reviewed-by: Yohei Yukawa <yukawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644491}