[android] Improve logging output.

build/android/pylib/utils/run_tests_helper.py

Index: build/android/pylib/utils/run_tests_helper.py
diff --git a/build/android/pylib/utils/run_tests_helper.py b/build/android/pylib/utils/run_tests_helper.py
index 15e5d5381bcc9b6d9a3e97dcbed40191556a9904..b5730b6893aa544b2096772fc95180fd992b3d7a 100644
--- a/build/android/pylib/utils/run_tests_helper.py
+++ b/build/android/pylib/utils/run_tests_helper.py
@@ -6,6 +6,26 @@
 
 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):
@@ -23,4 +43,8 @@ def SetLogLevel(verbose_count):
     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)