nodejs: Add light python wrappers for running node and friends

third_party/node/node_modules.py

+#!/usr/bin/env python
+# Copyright 2016 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.
+
+from os import path as os_path
+
+
+NODE_MODULES = os_path.join(os_path.dirname(__file__), 'node_modules')
+
+
+def _path_in_node_modules(*args):
+  return os_path.join(NODE_MODULES, *args)
+
+
+def PathToVulcanize():
+  return _path_in_node_modules('vulcanize', 'bin', 'vulcanize')
+
+
+def PathToCrisper():
+  return _path_in_node_modules('crisper', 'bin', 'crisper')
+
+
+def PathToPolymerCssBuild():
+  return _path_in_node_modules('polymer-css-build', 'bin', 'polymer-css-build')
+
+
+def PathToUglifyJs():
+ return _path_in_node_modules('uglifyjs', 'bin', 'uglifyjs')