[Android] Break GTest emulator launching into a separate function.

build/android/run_tests.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 all the native unit tests.
 
 1. Copy over test binary to /data/local on device.
 2. Resources: chrome/unit_tests requires resources (chrome.pak and en-US.pak)
@@ skipping 27 matching lines @@
 import copy
 import fnmatch
 import logging
 import optparse
 import os
 import signal
 import subprocess
 import sys
 import time
 
-import emulator
 from pylib import android_commands
 from pylib import buildbot_report
 from pylib import cmd_helper
 from pylib import ports
 from pylib.base_test_sharder import BaseTestSharder
 from pylib.gtest import debug_info
 from pylib.gtest.single_test_runner import SingleTestRunner
+from pylib.utils import emulator
 from pylib.utils import run_tests_helper
 from pylib.utils import test_options_parser
 from pylib.utils import time_profile
 from pylib.utils import xvfb
 
 
 _TEST_SUITES = ['base_unittests',
                 'cc_unittests',
                 'content_unittests',
                 'gpu_unittests',
@@ skipping 171 matching lines @@
 
   Returns:
     0 if successful, number of failing tests otherwise.
   """
   step_name = os.path.basename(options.test_suite).replace('-debug.apk', '')
   buildbot_report.PrintNamedStep(step_name)
   attached_devices = []
   buildbot_emulators = []
 
   if options.use_emulator:
-    for n in range(options.emulator_count):
-      t = time_profile.TimeProfile('Emulator launch %d' % n)
-      avd_name = None
-      if n > 0:
-        # Creates a temporary AVD for the extra emulators.
-        avd_name = 'run_tests_avd_%d' % n
-      buildbot_emulator = emulator.Emulator(avd_name)
-      buildbot_emulator.Launch(kill_all_emulators=n == 0)
-      t.Stop()
-      buildbot_emulators.append(buildbot_emulator)
-      attached_devices.append(buildbot_emulator.device)
-    # Wait for all emulators to boot completed.
-    map(lambda buildbot_emulator: buildbot_emulator.ConfirmLaunch(True),
-        buildbot_emulators)
+    buildbot_emulators = emulator.LaunchEmulators(options.emulator_count,
+                                                  wait_for_boot=True)
+    attached_devices = [e.device for e in buildbot_emulators]
   elif options.test_device:
     attached_devices = [options.test_device]
   else:
     attached_devices = android_commands.GetAttachedDevices()
 
   if not attached_devices:
     logging.critical('A device must be attached and online.')
     buildbot_report.PrintError()
     return 1
 
@@ skipping 92 matching lines @@
   # the batch (this happens because the exit status is a sum of all failures
   # from all suites, but the buildbot associates the exit status only with the
   # most recent step).
   if options.exit_code:
     return failed_tests_count
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))