Add a sketch of a test_perf script

sky/tools/sky_server

 #!/usr/bin/env python
 # 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 argparse
 import cherrypy
 import json
 import os
 import staticdirindex
-
-
-BUILD_DIRECTORY = 'out'
-CONFIG_DIRECTORY = 'Debug'
-SRC_ROOT = os.path.abspath(os.path.join(__file__, os.pardir, os.pardir,
-    os.pardir))
-SKY_ROOT = os.path.join(SRC_ROOT, 'sky')
-GEN_ROOT = os.path.join(SRC_ROOT, BUILD_DIRECTORY, CONFIG_DIRECTORY, 'gen')
-
+import skypy.paths as paths
 
 def skydir(section="", dir="", path="", **kwargs):
     if cherrypy.request.params.get('format') is None:
         return '<sky><import src="/sky/examples/file-browser.sky"/><file-browser/></sky>'
     result = dict()
     result['directories'] = []
     result['files'] = []
     for _, dir_names, file_names in os.walk(path.rstrip(r"\/")):
         for dir_name in sorted(dir_names):
             result["directories"].append(dir_name)
@@ skipping 25 matching lines @@
             # This causes some strange python exception??
             # 'log.error_log': os.path.join(log_dir, 'error_log.txt'),
         },
         '/': {
             'tools.staticdir.on': True,
             'tools.staticdir.dir': os.path.abspath(args.app_path),
             'tools.staticdir.indexlister': skydir,
         },
         '/mojo/public': {
             'tools.staticdir.on': True,
-            'tools.staticdir.dir': os.path.join(GEN_ROOT, 'mojo', 'public'),
+            'tools.staticdir.dir': os.path.join(paths.GEN_ROOT, 'mojo', 'public'),
         },
         '/mojo/services': {
             'tools.staticdir.on': True,
-            'tools.staticdir.dir': os.path.join(GEN_ROOT, 'mojo', 'services'),
+            'tools.staticdir.dir': os.path.join(paths.GEN_ROOT, 'mojo', 'services'),
         },
         '/sky/services': {
             'tools.staticdir.on': True,
-            'tools.staticdir.dir': os.path.join(GEN_ROOT, 'sky', 'services'),
+            'tools.staticdir.dir': os.path.join(paths.GEN_ROOT, 'sky', 'services'),
         },
      }
     cherrypy.quickstart(config=config)
 
 
 if __name__ == '__main__':
     main()