[Android] Converts host driven tests to common test_dispatcher

build/android/pylib/utils/run_tests_helper.py

 # Copyright (c) 2012 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.
 
-"""Helper functions common to native, java and python test runners."""
+"""Helper functions common to native, java and host-driven test runners."""
 
 import logging
-import os
 import sys
 import time
 
 
 class CustomFormatter(logging.Formatter):
   """Custom log formatter."""
 
   #override
   def __init__(self, fmt='%(threadName)-4s  %(message)s'):
     # Can't use super() because in older Python versions logging.Formatter does
@@ skipping 17 matching lines @@
   log_level = logging.WARNING  # Default.
   if verbose_count == 1:
     log_level = logging.INFO
   elif verbose_count >= 2:
     log_level = logging.DEBUG
   logger = logging.getLogger()
   logger.setLevel(log_level)
   custom_handler = logging.StreamHandler(sys.stdout)
   custom_handler.setFormatter(CustomFormatter())
   logging.getLogger().addHandler(custom_handler)