[devil refactor] Prepare clients for DeviceUnreachableError

build/android/pylib/local/device/local_device_gtest_run.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.
 
 import collections
 import itertools
 import logging
 import os
 import posixpath
 import time
@@ skipping 154 matching lines @@
     extras[_EXTRA_STDOUT_FILE] = stdout_file.name
 
     with command_line_file, test_list_file, stdout_file:
       try:
         device.StartInstrumentation(
             self._component, extras=extras, raw=False, **kwargs)
       except device_errors.CommandFailedError:
         logging.exception('gtest shard failed.')
       except device_errors.CommandTimeoutError:
         logging.exception('gtest shard timed out.')
+      except device_errors.DeviceUnreachableError:
+        logging.exception('gtest shard device unreachable.')
       except Exception:
         device.ForceStop(self._package)
         raise
       return device.ReadFile(stdout_file.name).splitlines()
 
   def PullAppFiles(self, device, files, directory):
     PullAppFilesImpl(device, self._package, files, directory)
 
   def Clear(self, device):
     device.ClearApplicationState(self._package, permissions=self._permissions)
@@ skipping 277 matching lines @@
     @local_device_environment.handle_shard_failures
     @trace_event.traced
     def individual_device_tear_down(dev):
       for s in self._servers.get(str(dev), []):
         s.TearDown()
 
       tool = self.GetTool(dev)
       tool.CleanUpEnvironment()
 
     self._env.parallel_devices.pMap(individual_device_tear_down)