[Andoid] Threaded TestRunner creation and SetUp and TearDown calls.

build/android/pylib/gtest/test_runner.py

 # 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.
 
 import glob
 import logging
 import os
 
 from pylib import android_commands
 from pylib import constants
@@ skipping 236 matching lines @@
       test: a gtest filter string to run.
 
     Returns:
       Tuple: (TestResults, test to retry or None)
     """
     test_results = test_result.TestResults()
     if not test:
       return test_results, None
 
     try:
+      self.test_package.ClearApplicationState()
       self.test_package.CreateTestRunnerScript(test, self._test_arguments)
       test_results = self.test_package.RunTestsAndListResults()
     except errors.DeviceUnresponsiveError as e:
       # Make sure this device is not attached
       logging.warning(e)
       if android_commands.IsDeviceAttached(self.device):
         raise
       test_results.device_exception = device_exception
     # Calculate unknown test results.
     # TODO(frankf): Do not break TestResults encapsulation.
     all_tests = set(test.split(':'))
     all_tests_ran = set([t.name for t in test_results.GetAll()])
     unknown_tests = all_tests - all_tests_ran
     test_results.unknown = [test_result.BaseTestResult(t, '') for t in
                             unknown_tests]
     retry = ':'.join([t.name for t in test_results.GetAllBroken()])
     return test_results, retry
 
   def SetUp(self):
     """Sets up necessary test enviroment for the test suite."""
     super(TestRunner, self).SetUp()
-    self.adb.ClearApplicationState(constants.CHROME_PACKAGE)
     self.StripAndCopyFiles()
     if _TestSuiteRequiresMockTestServer(self.test_package.test_suite_basename):
       self.LaunchChromeTestServerSpawner()
     self.tool.SetupEnvironment()
 
   def TearDown(self):
     """Cleans up the test enviroment for the test suite."""
     self.tool.CleanUpEnvironment()
     if self._cleanup_test_files:
       self.adb.RemovePushedFiles()
     super(TestRunner, self).TearDown()