[Android] Remove more uses of android_commands from build/android/pylib.

build/android/test_runner.py

 #!/usr/bin/env python
 #
 # 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.
 
 """Runs all types of tests from one unified interface."""
 
 import argparse
 import collections
 import logging
 import os
 import shutil
 import signal
 import sys
 import threading
 import unittest
 
-from pylib import android_commands
 from pylib import constants
 from pylib import forwarder
 from pylib import ports
 from pylib.base import base_test_result
 from pylib.base import environment_factory
 from pylib.base import test_dispatcher
 from pylib.base import test_instance_factory
 from pylib.base import test_run_factory
+from pylib.device import device_errors
+from pylib.device import device_utils
 from pylib.gtest import gtest_config
 from pylib.gtest import setup as gtest_setup
 from pylib.gtest import test_options as gtest_test_options
 from pylib.linker import setup as linker_setup
 from pylib.host_driven import setup as host_driven_setup
 from pylib.instrumentation import setup as instrumentation_setup
 from pylib.instrumentation import test_options as instrumentation_test_options
 from pylib.junit import setup as junit_setup
 from pylib.junit import test_dispatcher as junit_dispatcher
 from pylib.monkey import setup as monkey_setup
@@ skipping 822 matching lines @@
 
 def _GetAttachedDevices(test_device=None):
   """Get all attached devices.
 
   Args:
     test_device: Name of a specific device to use.
 
   Returns:
     A list of attached devices.
   """
-  attached_devices = []
+  attached_devices = device_utils.DeviceUtils.HealthyDevices()
+  if test_device:
+    test_device = [d for d in attached_devices if d == test_device]
+    if not test_device:
+      raise device_errors.DeviceUnreachableError(
+          'Did not find device %s among attached device. Attached devices: %s'
+          % (test_device, ', '.join(attached_devices)))
 
-  attached_devices = android_commands.GetAttachedDevices()
-  if test_device:
-    assert test_device in attached_devices, (
-        'Did not find device %s among attached device. Attached devices: %s'
-        % (test_device, ', '.join(attached_devices)))
-    attached_devices = [test_device]
-
-  assert attached_devices, 'No devices attached.'
+  if not attached_devices:
+    raise device_errors.NoDevicesError()
 
   return sorted(attached_devices)
 
 
 def RunTestsCommand(args, parser):
   """Checks test type and dispatches to the appropriate function.
 
   Args:
     args: argparse.Namespace object.
     parser: argparse.ArgumentParser object.
@@ skipping 139 matching lines @@
       return constants.INFRA_EXIT_CODE
     else:
       return constants.ERROR_EXIT_CODE
   except: # pylint: disable=W0702
     logging.exception('Unrecognized error occurred.')
     return constants.ERROR_EXIT_CODE
 
 
 if __name__ == '__main__':
   sys.exit(main())