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A new mojo method to send a key event from ArcInputMethodService in
Android to arc::ArcImeService will be added soon.
This CL moves KeyEventData struct to ime.mojom and define type mapping
between KeyEventData and ui::KeyEvent.

Bug: b:148193316
Test: component_unittests
Test: manual - InputConnection.SendKeyEvent still works.
Change-Id: I81ff4c11e1794c6e4c3e906596b770d01f21a6b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2208310Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Commit-Queue: Yuichiro Hanada <yhanada@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773585}