Update from https://crrev.com/304418

testing/scripts/common.py

 # Copyright 2014 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 argparse
 import contextlib
 import json
 import os
 import subprocess
 import sys
@@ skipping 50 matching lines @@
       sys.executable,
       os.path.join(cmd_args.paths['build'], 'scripts', 'tools', 'runit.py'),
       '--show-path',
       sys.executable,
       os.path.join(cmd_args.paths['build'], 'scripts', 'slave', 'runtest.py'),
       '--target', cmd_args.build_config_fs,
       '--xvfb',
       '--builder-name', cmd_args.properties['buildername'],
       '--slave-name', cmd_args.properties['slavename'],
       '--build-number', str(cmd_args.properties['buildnumber']),
+      '--build-properties', json.dumps(cmd_args.properties),
   ] + runtest_args)
 
 
 @contextlib.contextmanager
 def temporary_file():
   fd, path = tempfile.mkstemp()
   os.close(fd)
   try:
     yield path
   finally:
@@ skipping 43 matching lines @@
       key += 'passes'
       # TODO(dpranke): crbug.com/357867 ...  Why are we assigning result
       # instead of actual_result here. Do we even need these things to be
       # hashes, or just lists?
       data = result
     else:
       key += 'failures'
     results[key][test] = data
 
   return results