Restart app before running monkey test.

build/android/run_monkey_test.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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 the Monkey tests on one or more devices."""
 import logging
 import optparse
 import random
 import sys
 import time
 
 from pylib import android_commands
 from pylib import python_test_base
 from pylib import python_test_sharder
 from pylib import test_options_parser
 from pylib import test_result
 
 
 class MonkeyTest(python_test_base.PythonTestBase):
   def testMonkey(self):
     start_ms = int(time.time()) * 1000
 
     # Launch and wait for Chrome to launch.
     self.adb.StartActivity(self.options.package_name,
                            self.options.activity_name,
                            wait_for_completion=True,
-                           action='android.intent.action.MAIN')
+                           action='android.intent.action.MAIN',
+                           force_stop=True)
 
     # Chrome crashes are not always caught by Monkey test runner.
     # Verify Chrome has the same PID before and after the test.
     before_pids = self.adb.ExtractPid(self.options.package_name)
 
     # Run the test.
     output = ''
     duration_ms = 0
     if before_pids:
       output = '\n'.join(self._LaunchMonkeyTest())
@@ skipping 44 matching lines @@
            '--throttle %d' % throttle,
            '-s %d' % seed,
            '-v ' * verbosity,
            '--monitor-native-crashes',
            '--kill-process-after-error',
            extra_args,
            '%d' % event_count]
     return self.adb.RunShellCommand(' '.join(cmd), timeout_time=timeout_ms)
 
 
-
 def DispatchPythonTests(options):
   """Dispatches the Monkey tests, sharding it if there multiple devices."""
   logger = logging.getLogger()
   logger.setLevel(logging.DEBUG)
 
   available_tests = [MonkeyTest('testMonkey')]
   attached_devices = android_commands.GetAttachedDevices()
   if not attached_devices:
     raise Exception('You have no devices attached or visible!')
 
   # Actually run the tests.
   logging.debug('Running monkey tests.')
   available_tests *= len(attached_devices)
-  options.ensure_value('shard_retries',1)
+  options.ensure_value('shard_retries', 1)
   sharder = python_test_sharder.PythonTestSharder(
       attached_devices, available_tests, options)
   result = sharder.RunShardedTests()
   result.LogFull('Monkey', 'Monkey', options.build_type)
   result.PrintAnnotation()
 
+
 def main():
   desc = 'Run the Monkey tests on 1 or more devices.'
   parser = optparse.OptionParser(description=desc)
   test_options_parser.AddBuildTypeOption(parser)
   parser.add_option('--package-name', help='Allowed package.')
   parser.add_option('--activity-name',
                     default='com.google.android.apps.chrome.Main',
                     help='Name of the activity to start [default: %default].')
   parser.add_option('--category',
                     help='A list of allowed categories [default: ""].')
@@ skipping 21 matching lines @@
     parser.error('Missing package name')
 
   if options.category:
     options.category = options.category.split(',')
 
   DispatchPythonTests(options)
 
 
 if __name__ == '__main__':
   main()