Get Dromaeo benchmarks running again.

tools/testing/perf_testing/run_perf_tests.py

 #!/usr/bin/python
 
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 import datetime
 import math             
 try:            
   from matplotlib.font_manager import FontProperties            
@@ skipping 813 matching lines @@
       """Move the appropriate version of ChromeDriver onto the path. 
       TODO(efortuna): This is a total hack because the latest version of Chrome
       (Dartium builds) requires a different version of ChromeDriver, that is
       incompatible with the release or beta Chrome and vice versa. Remove these
       shenanigans once we're back to both versions of Chrome using the same
       version of ChromeDriver. IMPORTANT NOTE: This assumes your chromedriver is
       in the default location (inside depot_tools).
       """
       current_dir = os.getcwd()
       os.chdir(DART_INSTALL_LOCATION)
+      self.test.test_runner.run_cmd(['python', os.path.join(
+          'tools', 'get_drt.py'), '--chromedriver'])
       path = os.environ['PATH'].split(os.pathsep)
       orig_chromedriver_path = os.path.join('tools', 'testing',
                                             'orig-chromedriver')
       dartium_chromedriver_path = os.path.join('tools', 'testing',
                                                'dartium-chromedriver')
       extension = ''
       if platform.system() == 'Windows':
         extension = '.exe'
 
       def move_chromedriver(depot_tools, copy_to_depot_tools_dir=True,
@@ skipping 411 matching lines @@
     while True:
       if runner.has_new_code():
         runner.run_test_sequence()
       else:
         time.sleep(200)
   else:
     runner.run_test_sequence()
 
 if __name__ == '__main__':
   main()