Enable ui_struct_traits_unittests on try bots.

testing/buildbot/gn_isolate_map.pyl

 ## Copyright 2015 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.
 
 # gn_isolate_map.pyl - A mapping of Ninja build target names to GN labels and
 # test type classifications for the tests that are run on the bots.
 #
 # This mapping is used by MB so that we can uniformly refer to test binaries
 # by their Ninja target names in the recipes and not need to worry about how
 # they are referred to in GN or GYP specifically (the GYP target name is pretty
@@ skipping 584 matching lines @@
   },
   "ui_chromeos_unittests": {
     "label": "//ui/chromeos:ui_chromeos_unittests",
     "type": "unknown",
   },
   "ui_arc_unittests": {
     "label": "//ui/arc:ui_arc_unittests",
     "type": "raw",
     "args": [],
   },
+  "ui_struct_traits_unittests": {
+    "label": "//services/ui/public/interfaces:ui_struct_traits_unittests",
+    "type": "console_test_launcher",
+  },
   "ui_touch_selection_unittests": {
     "label": "//ui/touch_selection:ui_touch_selection_unittests",
     "type": "windowed_test_launcher",
   },
   "unit_tests": {
     "label": "//chrome/test:unit_tests",
     "type": "windowed_test_launcher",
   },
   "url_unittests": {
     "label": "//url:url_unittests",
@@ skipping 17 matching lines @@
   },
   "wm_unittests": {
     "label": "//ui/wm:wm_unittests",
     "type": "windowed_test_launcher",
   },
   "wtf_unittests": {
     "label": "//third_party/WebKit/Source/wtf:wtf_unittests",
     "type": "console_test_launcher",
   },
 }