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Modifies WaylandKeyboard::Delegate::OnKeyboardKeyEvent such that both
wl_keyboard and zwp_text_input (IME) decode key codes the same way (by
using Ozone's KeyboardLayoutEngine, xkbcommon, etc). Furthermore, this
simplifies its function signature, making it easier to use to inject key
events, such as in follow-up CL https://crrev.com/c/2417065.

No functional changes are expected.

R=msisov@igalia.com

Bug: None
Change-Id: Ia3610c5fbf9bb326c7f7ce4f1e4486083a348464
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2422429
Commit-Queue: Nick Yamane <nickdiego@igalia.com>
Reviewed-by: Maksim Sisov (GMT+3) <msisov@igalia.com>
Auto-Submit: Nick Yamane <nickdiego@igalia.com>
Cr-Commit-Position: refs/heads/master@{#809292}