Implement ArcInputMethodManagerService::OnImeInfoChanged().

OnImeInfoChanged() receives a list of installed IMEs in the ARC
container and registers them as valid IMEs to InputMethodManager.

Bug: 845079
Test: unit_tests
Change-Id: Ic7252c5d9021252228697e351a1c251c1f167e52
Reviewed-on: https://chromium-review.googlesource.com/1105684
Commit-Queue: Yuichiro Hanada <yhanada@chromium.org>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568745}
3 files changed