Android perf tests: always return 0 on the sharding stage.

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.
 
 TODO(gkanwar):
 * Add options to run Monkey tests.
@@ skipping 584 matching lines @@
 
 def _RunPerfTests(options, error_func):
   """Subcommand of RunTestsCommands which runs perf tests."""
   perf_options = ProcessPerfTestOptions(options, error_func)
     # Just print the results from a single previously executed step.
   if perf_options.print_step:
     return perf_test_runner.PrintTestOutput(perf_options.print_step)
 
   runner_factory, tests = perf_setup.Setup(perf_options)
 
-  results, exit_code = test_dispatcher.RunTests(
+  results, _ = test_dispatcher.RunTests(
       tests, runner_factory, False, None, shard=True, test_timeout=None)
 
   report_results.LogFull(
       results=results,
       test_type='Perf',
       test_package='Perf',
       build_type=options.build_type)
-
-  return exit_code
+  # Always return 0 on the sharding stage. Individual tests exit_code
+  # will be returned on the print_step stage.
+  return 0
 
 
 def RunTestsCommand(command, options, args, option_parser):
   """Checks test type and dispatches to the appropriate function.
 
   Args:
     command: String indicating the command that was received to trigger
         this function.
     options: optparse options dictionary.
     args: List of extra args from optparse.
@@ skipping 124 matching lines @@
     option_parser.error('Invalid command.')
   command = argv[1]
   VALID_COMMANDS[command].add_options_func(option_parser)
   options, args = option_parser.parse_args(argv)
   return VALID_COMMANDS[command].run_command_func(
       command, options, args, option_parser)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))