specify the reason for blacklisting

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 logging
 import os
 import threading
 
 from devil.android import device_blacklist
 from devil.android import device_errors
@@ skipping 78 matching lines @@
   def TearDown(self):
     # Write the cache even when not using it so that it will be ready the first
     # time that it is enabled. Writing it every time is also necessary so that
     # an invalid cache can be flushed just by disabling it for one run.
     for d in self._devices:
       cache_path = _DeviceCachePath(d)
       with open(cache_path, 'w') as f:
         f.write(d.DumpCacheData())
         logging.info('Wrote device cache: %s', cache_path)
 
-  def BlacklistDevice(self, device):
+  def BlacklistDevice(self, device, reason='local_device_failure'):
     if not self._blacklist:
       logging.warning(
           'Attempted to blacklist %s, but no blacklist was provided.',
           str(device))
       return
 
     device_serial = device.adb.GetDeviceSerial()
-    self._blacklist.Extend([device_serial])
+    self._blacklist.Extend([device_serial], reason=reason)
     with self._devices_lock:
       self._devices = [d for d in self._devices if str(d) != device_serial]