DevTools: speed up closure dependency checking

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 1164 matching lines @@
   }
 }
 
 group("devtools_closure_compile") {
   data = [
     # Needed for isolate script to execute.
     "front_end/",
     "scripts/build/",
     "scripts/closure/",
     "scripts/compile_frontend.py",
+    "scripts/dependency_checker.py",
     "scripts/jsdoc_validator/",
     "scripts/utils.py",
     "//testing/scripts/common.py",
     "//testing/scripts/run_devtools_check.py",
     "//testing/xvfb.py",
     "//third_party/WebKit/Source/core/inspector/browser_protocol.json",
     "//v8/src/inspector/js_protocol.json",
   ]
 }
 
 group("devtools_eslint") {
   data = [
     # Needed for isolate script to execute.
     ".eslintignore",
     ".eslintrc.js",
     "devtools-node-modules/",
     "front_end/",
     "scripts/buildbot/run_eslint.py",
     "scripts/local_node/",
     "//testing/scripts/common.py",
     "//testing/scripts/run_devtools_check.py",
     "//testing/xvfb.py",
   ]
 }