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Adding a flag for the IME support which doesn't need the
ConsumedByIme() workaround.
When the flag kSupported is specified as a Lacros's init param,
Lacros expects that the key events and keysym events are sent
in separated APIs without filtered by ConsumedByIme().
exo's new behavior for this new flag is implemented in a follow-up CL.

Bug: 1093194
Test: None
Change-Id: Id01aa2b064fff6db6fe7420c42e39a99b9c87866
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2631545
Commit-Queue: Naoki Fukino <fukino@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844466}