Add a sketch of a test_perf script

sky/tools/skydb

 #!/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 logging
 import os
+import skypy.paths as paths
+import socket;
 import subprocess
 import sys
 import urlparse
-import logging
-import socket;
 
 
-OUT_DIR = 'out'
-CONFIG_NAME = 'Debug'
-SKY_TOOLS_DIRECTORY = os.path.abspath(os.path.join(__file__, os.pardir))
-MOJO_ROOT = os.path.abspath(os.path.join(SKY_TOOLS_DIRECTORY, os.pardir,
-    os.pardir))
-MOJO_SHELL_PATH = os.path.join(MOJO_ROOT, OUT_DIR, CONFIG_NAME, 'mojo_shell')
-
 SUPPORTED_MIME_TYPES = [
     'text/html',
     'text/sky',
     'text/plain',
 ]
 
+
 class SkyDebugger(object):
     def __init__(self):
         self._sky_server = None
 
     @staticmethod
     def _port_in_use(port):
         sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
         return sock.connect_ex(('localhost', port)) == 0
 
     def _start_http_server_for_file(self, path):
         HTTP_PORT = 9999
 
         path = os.path.abspath(path)
-        if os.path.commonprefix([path, MOJO_ROOT]) == MOJO_ROOT:
-            server_root = MOJO_ROOT
+        if os.path.commonprefix([path, paths.SRC_ROOT]) == paths.SRC_ROOT:
+            server_root = paths.SRC_ROOT
         else:
             server_root = os.path.dirname(path)
             logging.warn(
                 '%s is outside of mojo root, using %s as server root' %
                 (path, server_root))
         relative_path = os.path.relpath(path, server_root)
 
         if self._port_in_use(HTTP_PORT):
             logging.warn(
                 'Port %s already in use, assuming custom sky_server started.' %
                 HTTP_PORT)
         else:
             server_command = [
-                os.path.join(SKY_TOOLS_DIRECTORY, 'sky_server'),
+                os.path.join(paths.SKY_TOOLS_DIRECTORY, 'sky_server'),
                 server_root,
                 str(HTTP_PORT),
             ]
             self._sky_server = subprocess.Popen(server_command)
         return 'http://localhost:%s/%s' % (HTTP_PORT, relative_path)
 
     def main(self):
         logging.basicConfig(level=logging.INFO)
 
         parser = argparse.ArgumentParser(description='Sky launcher/debugger')
         parser.add_argument('--gdb', action='store_true')
         parser.add_argument('--use-osmesa', action='store_true')
         parser.add_argument('url', nargs='?', type=str)
         args = parser.parse_args()
 
         content_handlers = ['%s,%s' % (mime_type, 'mojo://sky_viewer/')
             for mime_type in SUPPORTED_MIME_TYPES]
         shell_command = [
-            MOJO_SHELL_PATH,
+            paths.MOJO_SHELL_PATH,
             '--v=1',
             '--content-handlers=%s' % ','.join(content_handlers),
             '--url-mappings=mojo:window_manager=mojo:sky_debugger',
             'mojo:window_manager',
         ]
         if args.url:
             url = args.url
             if not urlparse.urlparse(url).scheme:
                 url = self._start_http_server_for_file(url)
 
@@ skipping 13 matching lines @@
 
 
 if __name__ == '__main__':
     skydb = SkyDebugger()
     try:
         skydb.main()
     except (KeyboardInterrupt, SystemExit):
         pass
     finally:
         skydb.shutdown()