ozone: Add initial build support for xkbcommon

This adds a use_xkbcommon variable that allows usage of libxkbcommon in
the build. Turn this on for linux ozone builds (except embedded builds).

BUG=430194
TEST=build

Review URL: https://codereview.chromium.org/751623003

Cr-Commit-Position: refs/heads/master@{#308204}

build/common.gypi

@@ -706,6 +706,13 @@
           'use_dbus%': 0,
         }],
 
+        # Libxkbcommon usage.
+        ['use_ozone==1 and embedded==0', {
+          'use_xkbcommon%': 1,
+        }, {
+          'use_xkbcommon%': 0,
+        }],
+
         # We always use skia text rendering in Aura on Windows, since GDI
         # doesn't agree with our BackingStore.
         # TODO(beng): remove once skia text rendering is on by default.
@@ -1087,6 +1094,7 @@
     'use_cairo%': '<(use_cairo)',
     'use_ozone%': '<(use_ozone)',
     'use_ozone_evdev%': '<(use_ozone_evdev)',
+    'use_xkbcommon%': '<(use_xkbcommon)',
     'use_clipboard_aurax11%': '<(use_clipboard_aurax11)',
     'desktop_linux%': '<(desktop_linux)',
     'use_x11%': '<(use_x11)',

build/linux/system.gyp

@@ -465,6 +465,27 @@
         },
       ],
     }],
+    ['use_xkbcommon==1', {
+      'targets': [
+        {
+          'target_name': 'xkbcommon',
+          'type': 'none',
+          'direct_dependent_settings': {
+            'cflags': [
+              '<!@(<(pkg-config) --cflags xkbcommon)'
+            ],
+          },
+          'link_settings': {
+            'ldflags': [
+              '<!@(<(pkg-config) --libs-only-L --libs-only-other xkbcommon)',
+            ],
+            'libraries': [
+              '<!@(<(pkg-config) --libs-only-l xkbcommon)',
+            ],
+          },
+        },
+      ],
+    }],
     ['ozone_platform_gbm==1', {
       'targets': [
         {

ui/events/ozone/BUILD.gn

@@ -3,8 +3,18 @@
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
+import("//build/config/linux/pkg_config.gni")
 import("//build/config/ui.gni")
 
+# Optional system libraries.
+use_xkbcommon = use_ozone
+
+if (use_xkbcommon) {
+  pkg_config("xkbcommon") {
+    packages = [ "xkbcommon" ]
+  }
+}
+
 component("events_ozone") {
   sources = [
     "chromeos/cursor_controller.cc",
@@ -38,6 +48,12 @@ component("events_ozone") {
   if (use_ozone_evdev && use_udev) {
     deps += [ "//device/udev_linux" ]
   }
+
+  if (use_xkbcommon) {
+    configs += [ ":xkbcommon" ]
+
+    defines += [ "USE_XKBCOMMON" ]
+  }
 }
 
 config("evdev") {

ui/events/ozone/events_ozone.gyp

@@ -36,6 +36,14 @@
           ['exclude', '_udev\\.(h|cc)$'],
         ],
       }],
+      ['use_xkbcommon==1', {
+        'dependencies': [
+          '../../../build/linux/system.gyp:xkbcommon',
+        ],
+        'defines': [
+          'USE_XKBCOMMON',
+        ],
+      }],
       ['use_ozone_evdev==1 and use_udev==1', {
         'dependencies': [
           '<(DEPTH)/device/udev_linux/udev.gyp:udev_linux',