DevTools: Add closure compile to buildbot to type check devtools front-end

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 359 matching lines @@
     "type": "console_test_launcher",
   },
   "dbus_unittests": {
     "label": "//dbus:dbus_unittests",
     "type": "windowed_test_launcher",
   },
   "device_unittests": {
     "label": "//device:device_unittests",
     "type": "console_test_launcher",
   },
+  "devtools_closure_compile": {
+    "label": "//third_party/WebKit/Source/devtools:devtools_closure_compile",
+    "type": "script",
+    "script": "//testing/scripts/run_devtools_closure_compile.py",
+    "args": [
+        "../../third_party/WebKit/Source/devtools/scripts/compile_frontend.py",
+    ],
+  },
   "display_unittests": {
     "label": "//ui/display:display_unittests",
     "type": "console_test_launcher",
   },
   "display_service_unittests": {
     "label": "//services/ui/display:display_service_unittests",
     "type": "console_test_launcher",
   },
   "events_unittests": {
     "label": "//ui/events:events_unittests",
@@ skipping 559 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",
   },
 }