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

testing/scripts/run_devtools_check.py

 #!/usr/bin/env python
 # 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.
 
 """Runs a python script under an isolate
 
 This script attempts to emulate the contract of gtest-style tests
 invoked via recipes. The main contract is that the caller passes the
 argument:
@@ skipping 32 matching lines @@
       rest_args.pop(index)
       break
     index += 1
 
   ret = common.run_command([sys.executable] + rest_args)
   with open(args.isolated_script_test_output, 'w') as fp:
     json.dump({'valid': True,
                'failures': ['failed'] if ret else []}, fp)
   return ret
 
+
+# This is not really a "script test" so does not need to manually add
+# any additional compile targets.
 def main_compile_targets(args):
-  json.dump(['devtools_closure_compile'], args.output)
+  json.dump([''], args.output)
 
 
 if __name__ == '__main__':
   # Conform minimally to the protocol defined by ScriptTest.
   if 'compile_targets' in sys.argv:
     funcs = {
       'run': None,
       'compile_targets': main_compile_targets,
     }
     sys.exit(common.run_script(sys.argv[1:], funcs))
   sys.exit(main())