Android: Make number of test retries configurable.

build/android/pylib/browsertests/dispatch.py

 # Copyright (c) 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.
 
 import logging
 import os
 
 from pylib import android_commands
 from pylib import cmd_helper
 from pylib import constants
@@ skipping 50 matching lines @@
                                                     attached_devices)
     all_tests = _FilterTests(all_enabled)
 
   # Run tests.
   # TODO(nileshagrawal): remove this abnormally long setup timeout once fewer
   # files are pushed to the devices for content_browsertests: crbug.com/138275
   setup_timeout = 20 * 60  # 20 minutes
   test_results = shard.ShardAndRunTests(RunnerFactory, attached_devices,
                                         all_tests, options.build_type,
                                         setup_timeout=setup_timeout,
-                                        test_timeout=None)
+                                        test_timeout=None,
+                                        num_retries=options.num_retries)
   report_results.LogFull(
       results=test_results,
       test_type='Unit test',
       test_package=constants.BROWSERTEST_SUITE_NAME,
       build_type=options.build_type,
       flakiness_server=options.flakiness_dashboard_server)
   report_results.PrintAnnotation(test_results)
 
 def _FilterTests(all_enabled_tests):
   """Filters out tests and fixtures starting with PRE_ and MANUAL_."""
   return [t for t in all_enabled_tests if _ShouldRunOnBot(t)]
 
 def _ShouldRunOnBot(test):
   fixture, case = test.split('.', 1)
   if _StartsWith(fixture, case, "PRE_"):
     return False
   if _StartsWith(fixture, case, "MANUAL_"):
     return False
   return True
 
 def _StartsWith(a, b, prefix):
   return a.startswith(prefix) or b.startswith(prefix)