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Spent some time trying to extract and reuse the |ImeListItemView|, but
it's not easy since it contains IME specific logic (e.g.
|set_last_item_selected_with_keyboard|). In fact I believe we should
try to combine the class with |HoverHighlightView|, but it's a somewhat
large refactoring and is beyond the scope of this CL.

Bug: 877749
Change-Id: I9f4582fdcf865da7b3960a625cedbbdf710c7e4f
Reviewed-on: https://chromium-review.googlesource.com/c/1341065Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Commit-Queue: Wenzhao (Colin) Zang <wzang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611530}