Adding 3 attempts at starting the browser for a gpu integration test.

content/test/gpu/gpu_tests/gpu_integration_test.py

 # Copyright 2016 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.
 
 import logging
 
 from telemetry.testing import serially_executed_browser_test_case
 
 from gpu_tests import exception_formatter
 from gpu_tests import gpu_test_expectations
 
 
 # Temporary class which bridges the gap beween these serially executed
 # browser tests and the old benchmark-based tests. As soon as all of
 # the tests have been coverted over, this will be deleted.
 class _EmulatedPage(object):
   def __init__(self, url, name):
     self.url = url
     self.name = name
 
 
+
 class GpuIntegrationTest(
     serially_executed_browser_test_case.SeriallyExecutedBrowserTestCase):
 
   _cached_expectations = None
 
+  def __init__(self, methodName):
+    super(GpuIntegrationTest, self).__init__(methodName)
+    self._num_retries = 0
+
   @classmethod
   def GenerateTestCases__RunGpuTest(cls, options):
     for test_name, url, args in cls.GenerateGpuTests(options):
       yield test_name, (url, test_name, args)
 
   def _RestartBrowser(self, reason):
-    logging.warning('Restarting browser due to ' + reason)
-    self.StopBrowser()
-    self.SetBrowserOptions(self._finder_options)
-    self.StartBrowser()
-    self.tab = self.browser.tabs[0]
+    try:
+      restart_attempt = ('Restarting browser %d time due to '
+        % (self._num_retries + 1))
+      logging.warning(restart_attempt + reason)
+      self.StopBrowser()
+      self.SetBrowserOptions(self._finder_options)
+      self.StartBrowser()
+      self.tab = self.browser.tabs[0]
+    except Exception:
+      if self._num_retries < 3:
+        self._num_retries += 1
+        # Attempt to resart the browser 3 times on failure
+        self._RestartBrowser(reason)

[nednguyen, 2016/07/25 15:13:31]

Can you do a for loop instead of recursion?

[eyaich, 2016/07/26 13:15:33]

Done.

+      else:
+        raise
 
   def _RunGpuTest(self, url, test_name, args):
     temp_page = _EmulatedPage(url, test_name)
     expectations = self.__class__.GetExpectations()
     expectation = expectations.GetExpectationForPage(
       self.browser, temp_page)
     if expectation == 'skip':
       # skipTest in Python's unittest harness raises an exception, so
       # aborts the control flow here.
       self.skipTest('SKIPPING TEST due to test expectations')
@@ skipping 79 matching lines @@
 
   def setUp(self):
     try:
       self.tab = self.browser.tabs[0]
     except Exception:
       # restart the browser to make sure a failure in a test doesn't
       # propagate to the next test iteration.
       logging.exception("Failure during browser startup")
       self._RestartBrowser('failure in setup')
       raise