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This patch adds character composition capabilities to ozone
wayland text input backend. To accomplish this it modifies
WaylandInputMethodContext, reusing ui::CharacterComposer
(previously chromeos-only) to handle key events forwared
by InputMethodAuraLinux.

BUG=921947

Change-Id: I9f06ed253ad0ba67b437ef683a6ed235cb57a1f2
Reviewed-on: https://chromium-review.googlesource.com/c/1448136Reviewed-by: Shu Chen <shuchen@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Commit-Queue: Nick Yamane <nickdiego@igalia.com>
Cr-Commit-Position: refs/heads/master@{#629160}