Make sure CHROMIUM_OUTPUT_DIR is set from runtest.py

scripts/slave/runtest.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """A tool used to run a Chrome test executable and process the output.
 
 This script is used by the buildbot slaves. It must be run from the outer
 build directory, e.g. chrome-release/build/.
 
@@ skipping 1498 matching lines @@
   Python scripts are the same as with Linux.
 
   Args:
     options: Command-line options for this invocation of runtest.py.
     args: Command and arguments for the test.
     extra_env: A dictionary of extra environment variables to set.
 
   Returns:
     Exit status code.
   """
+  if not os.environ.get('CHROMIUM_OUTPUT_DIR') and options.target:
+    extra_env['CHROMIUM_OUTPUT_DIR'] = (
+        os.path.abspath(os.path.join(options.build_dir, options.target)))
   if options.run_python_script:
     return _MainLinux(options, args, extra_env)
 
   if len(args) < 1:
     raise chromium_utils.MissingArgument('Usage: %s' % USAGE)
 
   if _ListLogProcessors(options.annotate):
     return 0
   log_processor_class = _SelectLogProcessor(options, False)
   log_processor = _CreateLogProcessor(log_processor_class, options, None)
@@ skipping 409 matching lines @@
   finally:
     if did_launch_dbus:
       # It looks like the command line argument --exit-with-session
       # isn't working to clean up the spawned dbus-daemon. Kill it
       # manually.
       _ShutdownDBus()
 
 
 if '__main__' == __name__:
   sys.exit(main())