[Android] Implement gtest and local in platform mode.

build/android/pylib/local/device/local_device_environment.py

+# Copyright 2014 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.
+
+from pylib.base import environment
+from pylib.device import adb_wrapper
+from pylib.device import device_errors
+from pylib.device import device_utils
+from pylib.utils import parallelizer
+
+
+class LocalDeviceEnvironment(environment.Environment):
+
+  def __init__(self, args, _error_func):
+    super(LocalDeviceEnvironment, self).__init__()
+    self._device = args.test_device
+    self._devices = []
+    self._max_tries = 1 + args.num_retries
+
+  #override
+  def SetUp(self):
+    # TODO(jbudorick): This can be refined to support filters etc.
+    available_devices = adb_wrapper.AdbWrapper.GetDevices()
+    if not available_devices:
+      raise device_errors.NoDevicesError
+    if self._device:
+      if self._device not in available_devices:
+        raise device_errors.DeviceUnreachableError(
+            'Could not find device %r' % self._device)
+      self._devices = [device_utils.DeviceUtils(self._device)]
+    else:
+      self._devices = [
+          device_utils.DeviceUtils(s)
+          for s in available_devices]
+
+  @property
+  def devices(self):
+    return self._devices
+
+  @property
+  def parallel_devices(self):
+    return parallelizer.SyncParallelizer(self._devices)
+
+  @property
+  def max_tries(self):
+    return self._max_tries
+
+  #override
+  def TearDown(self):
+    pass
+