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

testing/scripts/run_devtools_eslint.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:
+
+  --isolated-script-test-output=[FILENAME]
+
+json is written to that file in the format produced by
+common.parse_common_test_results.
+
+This script is intended to be the base command invoked by the isolate,
+followed by a subsequent Python script."""
+
+import argparse
+import json
+import os
+import sys
+
+
+import common
+
+# Add src/testing/ into sys.path for importing xvfb.
+sys.path.append(os.path.join(os.path.dirname(__file__), '..'))
+import xvfb
+
+
+def main():
+  parser = argparse.ArgumentParser()
+  parser.add_argument('--isolated-script-test-output', type=str,
+                      required=True)
+  args, rest_args = parser.parse_known_args()
+
+  ret = common.run_command([sys.executable] + rest_args)
+  with open(args.isolated_script_test_output) as fp:
+    json.dump({'valid': True,
+               'failures': ['failed'] if ret else []}, fp)
+
+def main_compile_targets(args):
+  json.dump(['devtools_eslint'], args.output)
+
+
+if __name__ == '__main__':
+  funcs = {
+    'run': main,
+    'compile_targets': main_compile_targets,
+  }
+  sys.exit(common.run_script(sys.argv[1:], funcs))