Add token to stderr as well as stdout for batch processing.

tools/testing/run_selenium.py

 #!/usr/bin/python
 
 # Copyright (c) 2011, 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.
 #
 
 """Script to actually open a browser and perform the test, and reports back with
 the result. It uses Selenium WebDriver when possible for running the tests. It
 uses Selenium RC for Safari.
@@ skipping 224 matching lines @@
             % (current_browser_name, browser_name))
         return 1
 
       # Start the browser on the first run
       if browser is None:
         current_browser_name = browser_name
         browser = start_browser(browser_name, html_out)
 
       source = run_test_in_browser(browser, html_out, timeout, is_perf)
 
+      # Test is done. Write end token to stderr and flush.
+      sys.stderr.write('>>> EOF STDERR\n')
+      sys.stderr.flush()
+
       # print one of:
       # >>> TEST {PASS, FAIL, OK, CRASH, FAIL, TIMEOUT}
       status = report_results(is_perf, source)
       if status == 0:
         print '>>> TEST PASS'
       elif source == TIMEOUT_ERROR_MSG:
         print '>>> TEST TIMEOUT'
       else:
         print '>>> TEST FAIL'
       sys.stdout.flush()
@@ skipping 12 matching lines @@
   browser = start_browser(browser_name, html_out)
 
   try:
     output = run_test_in_browser(browser, html_out, timeout, is_perf)
     return report_results(is_perf, output)
   finally:
     close_browser(browser)
 
 if __name__ == "__main__":
   sys.exit(main(sys.argv))