[ozone/wayland] Implement basic keyboard handling support

ui/ozone/platform/wayland/BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 visibility = [ "//ui/ozone/*" ]
 
 import("//build/config/linux/pkg_config.gni")
 
 pkg_config("wayland-egl") {
   packages = [ "wayland-egl" ]
 }
 
 source_set("wayland") {
   sources = [
     "client_native_pixmap_factory_wayland.cc",
     "client_native_pixmap_factory_wayland.h",
     "gl_surface_wayland.cc",
     "gl_surface_wayland.h",
     "ozone_platform_wayland.cc",
     "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",
     "wayland_output.h",
     "wayland_pointer.cc",
     "wayland_pointer.h",
     "wayland_surface_factory.cc",
     "wayland_surface_factory.h",
     "wayland_window.cc",
     "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",
     "//ui/ozone:ozone_base",
     "//ui/ozone/common",
     "//ui/platform_window",
   ]
 
   defines = [ "OZONE_IMPLEMENTATION" ]
 
   configs += [
     ":wayland-egl",
     "//third_party/khronos:khronos_headers",
   ]
 }
 
 source_set("wayland_unittests") {
   testonly = true
 
   sources = [
     "fake_server.cc",
     "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",
     "wayland_test.h",
     "wayland_window_unittest.cc",
   ]
 
   deps = [
     ":wayland",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/wayland:wayland_server",
     "//third_party/wayland-protocols:xdg_shell_protocol",
     "//ui/gfx:test_support",
     "//ui/ozone:platform",
   ]
 
   defines = [ "WL_HIDE_DEPRECATED" ]
 }