Refactor variations_combinations.py to use testing configs

tools/chrome_proxy/webdriver/common.py

 # 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.
 
 import argparse
 import json
 import logging
 import os
 import re
 import socket
@@ skipping 724 matching lines @@
       return True;
     return False;
 
   @staticmethod
   def RunAllTests(run_all_tests=False):
     """A simple helper method to run all tests using unittest.main().
 
     Args:
       run_all_tests: If True, all tests in the directory will be run, Otherwise
         only the tests in the file given on the command line will be run.
+    Returns:
+      the TestResult object from the test runner
     """
     flags = ParseFlags()
     logger = GetLogger()
     logger.debug('Command line args: %s', str(sys.argv))
     logger.info('sys.argv parsed to %s', str(flags))
     if flags.catch:
       unittest.installHandler()
     # Use python's test discovery to locate tests files that have subclasses of
     # unittest.TestCase and methods beginning with 'test'.
     pattern = '*.py' if run_all_tests else os.path.basename(sys.argv[0])
     loader = unittest.TestLoader()
     test_suite_iter = loader.discover(os.path.dirname(__file__),
       pattern=pattern)
     # Match class and method name on the given test filter from --test_filter.
     tests = unittest.TestSuite()
     test_filter_re = flags.test_filter.replace('.', r'\.').replace('*', '.*')
     for test_suite in test_suite_iter:
       for test_case in test_suite:
         for test in test_case:
           # Drop the file name in the form <filename>.<classname>.<methodname>
           test_id = test.id()[test.id().find('.') + 1:]
           if re.match(test_filter_re, test_id):
             tests.addTest(test)
     testRunner = unittest.runner.TextTestRunner(verbosity=2,
       failfast=flags.failfast, buffer=(not flags.disable_buffer))
-    testRunner.run(tests)
+    return testRunner.run(tests)