Add client-side Chromium Mojo testing config.

testing/buildbot/gn_isolate_map.pyl

Index: testing/buildbot/gn_isolate_map.pyl
diff --git a/testing/buildbot/gn_isolate_map.pyl b/testing/buildbot/gn_isolate_map.pyl
index e0515abadce60019dd039bcce02caffcbdf3c23e..47f9a900d60461cb15b5455c292f62f548200ba7 100644
--- a/testing/buildbot/gn_isolate_map.pyl
+++ b/testing/buildbot/gn_isolate_map.pyl
@@ -530,9 +530,9 @@
     "label": "//url:url_unittests",
     "type": "console_test_launcher",
   },
-  "window_manager_unittests": {
-    "label": "//components/mus/ws:window_manager_unittests",
-    "type": "unknown",
+  "views_mus_unittests": {
+    "label": "//ui/views/mus:views_mus_unittests",
+    "type": "windowed_test_launcher",
   },
   "views_unittests": {
     "label": "//ui/views:views_unittests",
@@ -542,6 +542,10 @@
     "label": "//third_party/WebKit/Source/web:webkit_unit_tests",
     "type": "console_test_launcher",
   },
+  "window_manager_unittests": {
+    "label": "//components/mus/ws:window_manager_unittests",
+    "type": "unknown",
+  },
   "wm_unittests": {
     "label": "//ui/wm:wm_unittests",
     "type": "windowed_test_launcher",