Adding logic to restart the browser if there is an exception

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 108 matching lines @@
 
   @classmethod
   def _CreateExpectations(cls):
     # Subclasses **must** override this in order to provide their test
     # expectations to the harness.
     #
     # Do not call this directly. Call GetExpectations where necessary.
     raise NotImplementedError
 
   def setUp(self):
-    self.tab = self.browser.tabs[0]
+    try:
+      self.tab = self.browser.tabs[0]
+    except Exception:

[Ken Russell (switch to Gerrit), 2016/07/15 18:05:24]

Please call exception_formatter.PrintFormattedException here so that we can
start to diagnose what's going wrong when this happens. Also please log
something about a failure happening during browser startup. Thanks.

[nednguyen, 2016/07/15 18:11:15]

Recently I found out about pythons' log.exception(msg) that renders
exception_formatter module in telemetry unnecessary :-P

[Ken Russell (switch to Gerrit), 2016/07/16 01:09:54]

Aha. Very good, we should file a cleanup bug. :)

[eyaich, 2016/07/21 17:58:06]

Done.

+      # restart the browser to make sure a failure in a test doesn't
+      # propagate to the next test iteration.
+      self._RestartBrowser('failure in setup')