message: Fix low bw test.
  The problem turned out to be that it passes . as the path, and that
  does not work in the PYTHONPATH.
  Also remove debug logging.
  Cr-Commit-Position: refs/heads/master@{#30903}
diff: @@ -230,17 +230,9 @@ def _ConfigurePythonPath(args):
  # python, so put it in the path for this script before we attempt to import
  # it.
  histogram_proto_path = os.path.join(
  - args.build_dir, 'pyproto', 'tracing', 'tracing', 'proto')
  + os.path.abspath(args.build_dir), 'pyproto', 'tracing', 'tracing', 'proto')
  sys.path.insert(0, histogram_proto_path)
  - logging.info('Contents of build dir:')
  - logging.info(str(os.listdir(args.build_dir)))
  - for root, dirs, files in os.walk(os.path.join(args.build_dir, 'pyproto')):
  - path = root.split(os.sep)
  - logging.info((len(path) - 1) * '---' + os.path.basename(root))
  - for file in files:
  - logging.info(len(path) * '---' + file)
  -
  # Fail early in case the proto hasn't been built.
  from tracing.proto import histogram_proto
  if not histogram_proto.HAS_PROTO:
  @@ -253,7 +245,6 @@ def _ConfigurePythonPath(args):
  def main():
  # pylint: disable=W0101
  logging.basicConfig(level=logging.INFO)
  - logging.info('Invoked with %s', str(sys.argv))
  args = _ParseArgs()
  