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-Original-Commit-Position: refs/heads/master@{#308204}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 304529e882cd79826c1b8f222a0e855da2ba8a59

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)',

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': [
         {