Ported pixel_test to new gpu_integration_test harness.

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 telemetry.util import screenshot
 
 from gpu_tests import exception_formatter
@@ skipping 33 matching lines @@
         if x == 2:
           url = screenshot.TryCaptureScreenShotAndUploadToCloudStorage(
             cls.platform)
           if url is not None:
             logging.info("GpuIntegrationTest screenshot of browser failure " +
               "located at " + url)
           else:
             logging.warning("GpuIntegrationTest unable to take screenshot")
           raise
 
-  def _RestartBrowser(self, reason):
+  @classmethod
+  def _RestartBrowser(cls, reason):
     logging.warning('Restarting browser due to '+ reason)
-    self.StopBrowser()
-    self.SetBrowserOptions(self._finder_options)
-    self.StartBrowser()
-    self.tab = self.browser.tabs[0]
+    cls.StopBrowser()
+    cls.SetBrowserOptions(cls._finder_options)
+    cls.StartBrowser()
+    cls.tab = cls.browser.tabs[0]
 
   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 81 matching lines @@
     return cls._cached_expectations
 
   @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):
+  @classmethod
+  def _EnsureTabIsAvailable(cls):
     try:
-      self.tab = self.browser.tabs[0]
+      cls.tab = cls.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')
+      cls._RestartBrowser('failure in setup')
       raise
+
+  def setUp(self):
+    self._EnsureTabIsAvailable()