Run gl_unittests with Ozone X11.

ui/gl/BUILD.gn

Index: ui/gl/BUILD.gn
diff --git a/ui/gl/BUILD.gn b/ui/gl/BUILD.gn
index 69262b487beae6ba61cf145e783b4455e2846df5..df83289be89ddaf0718d301d209e6d8f6e3372e4 100644
--- a/ui/gl/BUILD.gn
+++ b/ui/gl/BUILD.gn
@@ -404,6 +404,22 @@ test("gl_unittests") {
   ]
 }
 
+group("gl_unittests_ozonex") {
+  testonly = true
+  data_deps = [
+    ":gl_unittests",
+  ]
+}
+
+# TODO(GYP_GONE): Delete this after we've converted everything to GN.
+# The _run targets exist only for compatibility w/ GYP.
+group("gl_unittests_ozonex_run") {
+  testonly = true
+  deps = [
+    ":gl_unittests_ozonex",
+  ]
+}
+
 if (is_android) {
   generate_jar_jni("surface_jni_headers") {
     jni_package = "ui/gl"