[Android] Print the stack of deadlocked threads when sharding.

build/android/pylib/base/shard_unittest.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.
 
 """Unittests for shard.py."""
 
 import os
 import sys
 import unittest
 
 sys.path.append(os.path.join(os.path.dirname(os.path.realpath(__file__)),
                 os.pardir, os.pardir))
 
 # Mock out android_commands.GetAttachedDevices().
 from pylib import android_commands
 android_commands.GetAttachedDevices = lambda: ['0', '1']
+from pylib.utils import watchdog_timer
 
 import base_test_result
 import shard
 
 
 class TestException(Exception):
   pass
 
 
 class MockRunner(object):
@@ skipping 47 matching lines @@
   def RunTest(self, test):
     raise TestException
 
 
 class TestFunctions(unittest.TestCase):
   """Tests for shard._RunTestsFromQueue."""
   @staticmethod
   def _RunTests(mock_runner, tests):
     results = []
     tests = shard._TestCollection([shard._Test(t) for t in tests])
-    shard._RunTestsFromQueue(mock_runner, tests, results)
+    shard._RunTestsFromQueue(mock_runner, tests, results,
+                             watchdog_timer.WatchdogTimer(None))
     run_results = base_test_result.TestRunResults()
     for r in results:
       run_results.AddTestRunResults(r)
     return run_results
 
   def testRunTestsFromQueue(self):
     results = TestFunctions._RunTests(MockRunner(), ['a', 'b'])
     self.assertEqual(len(results.GetPass()), 2)
     self.assertEqual(len(results.GetNotPass()), 0)
 
@@ skipping 67 matching lines @@
     self.assertEqual(len(results.GetPass()), 3)
 
   def testFailing(self):
     results = TestShard._RunShard(MockRunnerFail)
     self.assertEqual(len(results.GetPass()), 0)
     self.assertEqual(len(results.GetFail()), 3)
 
 
 if __name__ == '__main__':
   unittest.main()