Add mus_browser_tests to Mojo FYI 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.
 
 # This is a .pyl, or "Python Literal", file. You can treat it just like a
 # .json file, with the following exceptions:
 # * all keys must be quoted (use single quotes, please);
 # * comments are allowed, using '#' syntax; and
 # * trailing commas are allowed.
 
@@ skipping 718 matching lines @@
     "type": "console_test_launcher",
   },
   "mojo_system_unittests": {
     "label": "//mojo/edk/system:mojo_system_unittests",
     "type": "console_test_launcher",
   },
   "mojo_test_apk": {
     "label": "//mojo/android:mojo_test_apk",
     "type": "console_test_launcher",
   },
+  "mus_browser_tests": {
+    "label": "//chrome/test:mus_browser_tests",
+    "label_type": "group",
+    "type": "windowed_test_launcher",
+    "executable": "browser_tests",
+    "args": [
+      "--run-in-mus",
+      "--service-overrides=../../chrome/app/mash/mash_service_overrides.json",
+    ],
+  },
   "mus_clipboard_unittests": {
     "label": "//services/ui/clipboard:mus_clipboard_unittests",
     "type": "windowed_test_launcher",
   },
   "mus_public_unittests": {
     "label": "//services/ui/public/cpp/tests:mus_public_unittests",
     "type": "windowed_test_launcher",
   },
   "message_center_unittests": {
     "label": "//ui/message_center:message_center_unittests",
@@ skipping 365 matching lines @@
   },
   "wm_unittests": {
     "label": "//ui/wm:wm_unittests",
     "type": "windowed_test_launcher",
   },
   "wtf_unittests": {
     "label": "//third_party/WebKit/Source/platform/wtf:wtf_unittests",
     "type": "console_test_launcher",
   },
 }