[Telemetry] Refactor common Android cleanup functions.

build/android/pylib/perf/setup.py

 # 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.
 
 """Generates test runner factory and tests for performance tests."""
 
 import json
 import fnmatch
 import logging
 import os
 import psutil
 import signal
 import shutil
 import time
 
-from pylib import android_commands
-from pylib import cmd_helper
 from pylib import constants
 from pylib import forwarder
-from pylib import ports
+from pylib.utils import test_environment
 
 import test_runner
 
 
-def _KillPendingServers():
-  for retry in range(5):
-    for server in ['lighttpd', 'web-page-replay']:
-      pids = [p.pid for p in psutil.process_iter() if server in p.name]
-      for pid in pids:
-        try:
-          logging.warning('Killing %s %s', server, pid)
-          os.kill(pid, signal.SIGQUIT)
-        except Exception as e:
-          logging.warning('Failed killing %s %s %s', server, pid, e)
-  # Restart the adb server with taskset to set a single CPU affinity.
-  cmd_helper.RunCmd([constants.ADB_PATH, 'kill-server'])
-  cmd_helper.RunCmd(['taskset', '-c', '0', constants.ADB_PATH, 'start-server'])
-  cmd_helper.RunCmd(['taskset', '-c', '0', constants.ADB_PATH, 'root'])
-  i = 1
-  while not android_commands.GetAttachedDevices():
-    time.sleep(i)
-    i *= 2
-    if i > 10:
-      break
-
-  forwarder.Forwarder.UseMultiprocessing()
-
-
 def Setup(test_options):
   """Create and return the test runner factory and tests.
 
   Args:
     test_options: A PerformanceOptions object.
 
   Returns:
     A tuple of (TestRunnerFactory, tests).
   """
   # TODO(bulach): remove this once the bot side lands. BUG=318369
   constants.SetBuildType('Release')
   if os.path.exists(constants.PERF_OUTPUT_DIR):
     shutil.rmtree(constants.PERF_OUTPUT_DIR)
   os.makedirs(constants.PERF_OUTPUT_DIR)
 
   # Before running the tests, kill any leftover server.
-  _KillPendingServers()
+  test_environment.CleanupLeftoverProcesses()
+  forwarder.Forwarder.UseMultiprocessing()
 
   if test_options.single_step:
     # Running a single command, build the tests structure.
     tests = [['single_step', test_options.single_step]]
 
   if test_options.steps:
     with file(test_options.steps, 'r') as f:
       tests = json.load(f)
 
   # The list is necessary to keep the steps order, but internally
@@ skipping 11 matching lines @@
   flaky_steps = []
   if test_options.flaky_steps:
     with file(test_options.flaky_steps, 'r') as f:
       flaky_steps = json.load(f)
 
   def TestRunnerFactory(device, shard_index):
     return test_runner.TestRunner(
         test_options, device, tests_dict, flaky_steps)
 
   return (TestRunnerFactory, sorted_test_names)