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

third_party/WebKit/Source/devtools/BUILD.gn

Index: third_party/WebKit/Source/devtools/BUILD.gn
diff --git a/third_party/WebKit/Source/devtools/BUILD.gn b/third_party/WebKit/Source/devtools/BUILD.gn
index 56925ef7aef8cbf7568d9eedc178dbebc5af9a37..f83c56ca248fb804a650a65d003592467930ab20 100644
--- a/third_party/WebKit/Source/devtools/BUILD.gn
+++ b/third_party/WebKit/Source/devtools/BUILD.gn
@@ -899,6 +899,13 @@ 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 = [
@@ -1155,3 +1162,7 @@ if (debug_devtools) {
     ]
   }
 }
+
+group("eslint") {
+  data = eslint_files + all_devtools_files
+}