Update from https://crrev.com/316786

build/android/pylib/instrumentation/test_runner.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.
 
 """Class for running instrumentation tests on a single device."""
 
 import logging
 import os
 import re
 import sys
@@ skipping 300 matching lines @@
       test: Test class/method.
       timeout: Timeout time in seconds.
 
     Returns:
       The raw output of am instrument as a list of lines.
     """
     extras = self._GetInstrumentationArgs()
     extras['class'] = test
     return self.device.StartInstrumentation(
         '%s/%s' % (self.test_pkg.GetPackageName(), self.options.test_runner),
-        raw=True, extras=extras, timeout=timeout, retries=0)
+        raw=True, extras=extras, timeout=timeout, retries=3)
 
   def _GenerateTestResult(self, test, instr_statuses, start_ms, duration_ms):
     return instrumentation_test_instance.GenerateTestResult(
         test, instr_statuses, start_ms, duration_ms)
 
   #override
   def RunTest(self, test):
     results = base_test_result.TestRunResults()
     timeout = (self._GetIndividualTestTimeoutSecs(test) *
                self._GetIndividualTestTimeoutScale(test) *
@@ skipping 23 matching lines @@
     except device_errors.CommandTimeoutError as e:
       results.AddResult(test_result.InstrumentationTestResult(
           test, base_test_result.ResultType.TIMEOUT, start_ms, duration_ms,
           log=str(e) or 'No information'))
     except device_errors.DeviceUnreachableError as e:
       results.AddResult(test_result.InstrumentationTestResult(
           test, base_test_result.ResultType.CRASH, start_ms, duration_ms,
           log=str(e) or 'No information'))
     self.TestTeardown(test, results)
     return (results, None if results.DidRunPass() else test)