Updates the test runner script exit codes

build/android/pylib/host_driven/run_python_tests.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.
 
 """Runs the Python tests (relies on using the Java test runner)."""
 
 import logging
 import os
 import sys
 import types
@@ skipping 87 matching lines @@
 
   # Actually run the tests.
   if len(attached_devices) > 1 and options.wait_for_debugger:
     logging.warning('Debugger can not be sharded, '
                     'using first available device')
     attached_devices = attached_devices[:1]
   logging.debug('Running Python tests')
   sharder = PythonTestSharder(attached_devices, available_tests, options)
   test_results = sharder.RunShardedTests()
 
-  return test_results
+  if not test_results.DidRunPass():
+    return (test_results, 1)
+
+  return (test_results, 0)
 
 
 def _GetTestModules(python_test_root, is_official_build):
   """Retrieve a sorted list of pythonDrivenTests.
 
   Walks the location of pythonDrivenTests, imports them, and provides the list
   of imported modules to the caller.
 
   Args:
     python_test_root: the path to walk, looking for pythonDrivenTests
@@ skipping 86 matching lines @@
   Returns:
     List of test case objects for all available test methods.
   """
   if not test_root:
     return []
   all_tests = []
   test_module_list = _GetTestModules(test_root, is_official_build)
   for module in test_module_list:
     all_tests.extend(_GetTestClassesFromModule(module))
   return all_tests