Switch webgl2_conformance_tests to new harness, and shard them.

testing/scripts/run_gpu_integration_test_as_googletest.py

 #!/usr/bin/env python
 # Copyright 2015 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.
 
 """Runs an isolate bundled Telemetry GPU integration test.
 
 This script attempts to emulate the contract of gtest-style tests
 invoked via recipes. The main contract is that the caller passes the
 argument:
@@ skipping 62 matching lines @@
       '--total-shards=%d' % total_shards,
       '--shard-index=%d' % shard_index
     ]
   try:
     valid = True
     rc = 0
     try:
       rc = common.run_command([sys.executable] + rest_args + sharding_args + [
         '--write-abbreviated-json-results-to', args.isolated_script_test_output,
       ], env=env)
-      valid = bool(rc == 0)
     except Exception:
       traceback.print_exc()
       valid = False
 
     if not valid:
       failures = ['(entire test suite)']
       with open(args.isolated_script_test_output, 'w') as fp:
         json.dump({
             'valid': valid,
             'failures': failures,
@@ skipping 15 matching lines @@
 
 if __name__ == '__main__':
   # Conform minimally to the protocol defined by ScriptTest.
   if 'compile_targets' in sys.argv:
     funcs = {
       'run': None,
       'compile_targets': main_compile_targets,
     }
     sys.exit(common.run_script(sys.argv[1:], funcs))
   sys.exit(main())