[Telemetry] Refactor common Android cleanup functions.

build/android/pylib/perf/setup.py

Index: build/android/pylib/perf/setup.py
diff --git a/build/android/pylib/perf/setup.py b/build/android/pylib/perf/setup.py
index 0c976bd7f11f0b808d2c06935f8384c0b5432513..0d07c961c470369a5e964d3034ea5766e31fb79e 100644
--- a/build/android/pylib/perf/setup.py
+++ b/build/android/pylib/perf/setup.py
@@ -13,39 +13,13 @@ 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.
 
@@ -62,7 +36,8 @@ def Setup(test_options):
   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.