Add support for json-results-file option for Junit tests.

build/android/test_runner.py

 #!/usr/bin/env python
 #
 # Copyright 2013 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.
 
 """Runs all types of tests from one unified interface."""
 
 import argparse
 import collections
@@ skipping 757 matching lines @@
 def _RunJUnitTests(args):
   """Subcommand of RunTestsCommand which runs junit tests."""
   runner_factory, tests = junit_setup.Setup(args)
   results, exit_code = junit_dispatcher.RunTests(tests, runner_factory)
 
   report_results.LogFull(
       results=results,
       test_type='JUnit',
       test_package=args.test_suite)
 
+  if args.json_results_file:
+    json_results.GenerateJsonResultsFile(results, args.json_results_file)
+
   return exit_code
 
 
 def _RunMonkeyTests(args, devices):
   """Subcommand of RunTestsCommands which runs monkey tests."""
   monkey_options = ProcessMonkeyTestOptions(args)
 
   runner_factory, tests = monkey_setup.Setup(monkey_options)
 
   results, exit_code = test_dispatcher.RunTests(
@@ skipping 241 matching lines @@
       return constants.INFRA_EXIT_CODE
     else:
       return constants.ERROR_EXIT_CODE
   except: # pylint: disable=W0702
     logging.exception('Unrecognized error occurred.')
     return constants.ERROR_EXIT_CODE
 
 
 if __name__ == '__main__':
   sys.exit(main())