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It will be used by the proxy IME to send a key event to the host IME.
Chrome returns whether it's consumed by the host IME. Android will let
an ARC app handle the event if it's not consumed by the host IME.

Bug: b:148193316
Change-Id: I72dcb63d0853cd87baab5f3ab911e704628e2edf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2273038Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Mattias Nissler <mnissler@chromium.org>
Commit-Queue: Yuichiro Hanada <yhanada@chromium.org>
Cr-Commit-Position: refs/heads/master@{#785623}