DevTools: Add support for installing node and running eslint over devtools.

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 881 matching lines @@
     devtools_source_frame_js_files + devtools_sources_js_files +
     devtools_utility_shared_worker_js_files + devtools_text_editor_js_files +
     devtools_terminal_js_files + devtools_timeline_model_js_files +
     devtools_timeline_js_files + devtools_ui_lazy_js_files +
     devtools_layer_viewer_js_files + devtools_worker_service_js_files
 
 all_devtools_files = devtools_cm_css_files + devtools_cm_js_files +
                      devtools_core_files + devtools_module_json_files +
                      devtools_modules_js_files + devtools_acorn_files
 
+eslint_files = [
+  ".eslintignore",
+  ".eslintrc.js",
+  "scripts/lint_javascript.py",
+  "scripts/local_node/runtimes/4.5.0/bin/node",
+]
+
 resources_out_dir = "$root_out_dir/resources/inspector"
 
 generated_scripts = [
   "$resources_out_dir/InspectorBackendCommands.js",
   "$resources_out_dir/SupportedCSSProperties.js",
 ]
 
 generated_entry_files = [
   "$resources_out_dir/inspector.html",
   "$resources_out_dir/inspector.js",
@@ skipping 236 matching lines @@
     deps = [
       ":frontend_protocol_sources",
       ":supported_css_properties",
     ]
     sources = generated_scripts
     outputs = [
       "$resources_out_debug_dir/{{source_file_part}}",
     ]
   }
 }
+
+group("eslint") {
+  data = eslint_files + all_devtools_files
+}