Switch webgl2_conformance_tests to new harness, and shard them.

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 15 matching lines @@
 
   @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.StartBrowser(self._finder_options)
+    self.tab = self.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 72 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]