[android] Improve logging output.

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."""
 
 import logging
 import os
+import time
+
+
+class CustomFormatter(logging.Formatter):
+  """Custom log formatter."""
+
+  #override
+  def __init__(self, fmt=''):
+    # Can't use super() because in older Python versions logging.Formatter does
+    # not inherit from object.
+    logging.Formatter.__init__(self, fmt=fmt)
+    self._creation_time = time.time()
+
+  #override
+  def format(self, record):
+    # Can't use super() because in older Python versions logging.Formatter does
+    # not inherit from object.
+    msg = logging.Formatter.format(self, record)
+    timediff = str(int(time.time() - self._creation_time))
+    return '%s %ss  %s' % (record.levelname[0], timediff.rjust(4), msg)
 
 
 def GetExpectations(file_name):
   """Returns a list of test names in the |file_name| test expectations file."""
   if not file_name or not os.path.exists(file_name):
     return []
   return [x for x in [x.strip() for x in file(file_name).readlines()]
           if x and x[0] != '#']
 
 
 def SetLogLevel(verbose_count):
   """Sets log level as |verbose_count|."""
   log_level = logging.WARNING  # Default.
   if verbose_count == 1:
     log_level = logging.INFO
   elif verbose_count >= 2:
     log_level = logging.DEBUG
-  logging.getLogger().setLevel(log_level)
+  logger = logging.getLogger()
+  logger.setLevel(log_level)
+  custom_handler = logging.StreamHandler()
+  custom_handler.setFormatter(CustomFormatter())
+  logging.getLogger().addHandler(custom_handler)