[ozone/wayland] Implement basic keyboard handling support

ui/ozone/platform/wayland/BUILD.gn

Index: ui/ozone/platform/wayland/BUILD.gn
diff --git a/ui/ozone/platform/wayland/BUILD.gn b/ui/ozone/platform/wayland/BUILD.gn
index 494ab6005256fd07c39b6b5353e8c5c29bbdac1f..8d80aa90ef52637d2b0bcc3460e8cc93cc1681d8 100644
--- a/ui/ozone/platform/wayland/BUILD.gn
+++ b/ui/ozone/platform/wayland/BUILD.gn
@@ -20,6 +20,8 @@ source_set("wayland") {
     "ozone_platform_wayland.h",
     "wayland_connection.cc",
     "wayland_connection.h",
+    "wayland_keyboard.cc",
+    "wayland_keyboard.h",
     "wayland_object.cc",
     "wayland_object.h",
     "wayland_output.cc",
@@ -32,13 +34,23 @@ source_set("wayland") {
     "wayland_window.h",
   ]
 
+  import("//ui/base/ui_features.gni")
+  if (use_xkbcommon) {
+    sources += [
+      "wayland_xkb_keyboard_layout_engine.cc",
+      "wayland_xkb_keyboard_layout_engine.h",
+    ]
+  }
+
   deps = [
     "//base",
     "//skia",
     "//third_party/wayland:wayland_client",
     "//third_party/wayland-protocols:xdg_shell_protocol",
+    "//ui/base:ui_features",
     "//ui/display",
     "//ui/events",
+    "//ui/events/ozone:events_ozone_layout",
     "//ui/events/platform",
     "//ui/gfx",
     "//ui/gfx/geometry",
@@ -63,6 +75,7 @@ source_set("wayland_unittests") {
     "fake_server.h",
     "mock_platform_window_delegate.cc",
     "wayland_connection_unittest.cc",
+    "wayland_keyboard_unittest.cc",
     "wayland_pointer_unittest.cc",
     "wayland_surface_factory_unittest.cc",
     "wayland_test.cc",