[Android] Explicitly check that devices are online during test set up.

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.
 
 import datetime
 import functools
 import logging
 import os
 import shutil
 import tempfile
@@ skipping 103 matching lines @@
         self._blacklist, enable_device_files_cache=self._enable_device_cache,
         default_retries=self._max_tries - 1, device_arg=device_arg)
     if not self._devices:
       raise device_errors.NoDevicesError
 
     if self._logcat_output_file:
       self._logcat_output_dir = tempfile.mkdtemp()
 
     @handle_shard_failures_with(on_failure=self.BlacklistDevice)
     def prepare_device(d):
+      d.WaitUntilFullyBooted(timeout=10, retries=0)
+
       if self._enable_device_cache:
         cache_path = _DeviceCachePath(d)
         if os.path.exists(cache_path):
           logging.info('Using device cache: %s', cache_path)
           with open(cache_path) as f:
             d.LoadCacheData(f.read())
           # Delete cached file so that any exceptions cause it to be cleared.
           os.unlink(cache_path)
 
       if self._logcat_output_dir:
@@ skipping 88 matching lines @@
            if os.path.exists(m.output_file)])
       shutil.rmtree(self._logcat_output_dir)
 
   def BlacklistDevice(self, device, reason='local_device_failure'):
     device_serial = device.adb.GetDeviceSerial()
     if self._blacklist:
       self._blacklist.Extend([device_serial], reason=reason)
     with self._devices_lock:
       self._devices = [d for d in self._devices if str(d) != device_serial]