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
@@ skipping 12 matching lines @@
     serially_executed_browser_test_case.SeriallyExecutedBrowserTestCase):
 
   _cached_expectations = None
 
   @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]
+    for x in range(0, 3):
+      try:
+        restart_attempt = ('Restarting browser %d time due to '
+          % (x + 1))
+        logging.warning(restart_attempt + reason)
+        self.StopBrowser()
+        self.SetBrowserOptions(self._finder_options)
+        self.StartBrowser()
+        self.tab = self.browser.tabs[0]
+        return
+      except Exception:
+        # If we are on the last try and there is an exception raise it
+        if x == 2:
+          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