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

third_party/WebKit/Source/devtools/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//third_party/WebKit/public/public_features.gni")
 import("//third_party/WebKit/Source/core/core.gni")
 
 devtools_embedder_scripts = [
   "front_end/devtools_compatibility.js",
@@ skipping 1138 matching lines @@
     deps = [
       ":frontend_protocol_sources",
       ":supported_css_properties",
     ]
     sources = generated_scripts
     outputs = [
       "$resources_out_debug_dir/{{source_file_part}}",
     ]
   }
 }
+
+group("devtools_closure_compile") {
+  data = [
+    # Needed for isolate script to execute.
+    "front_end/",
+    "scripts/build/",
+    "scripts/closure/",
+    "scripts/compile_frontend.py",
+    "scripts/jsdoc_validator/",
+    "//testing/scripts/run_devtools_closure_compile.py",
+    "//testing/scripts/common.py",
+    "//testing/xvfb.py",
+    "//third_party/WebKit/Source/core/inspector/browser_protocol.json",
+    "//v8/src/inspector/js_protocol.json",
+  ]
+}