@@ -24,7 +24,7 @@ class ChromiumService(service.Service):
     """
 
     def __init__(self, executable_path, port=0, service_args=None,
-                 log_path=None, env=None, start_error_message=None):
+                 log_path=None, env=None, start_error_message=None, create_no_window=False):
         """
         Creates a new instance of the Service
 
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# to you under the Apache License, Version 2.0 (the
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#   http://www.apache.org/licenses/LICENSE-2.0
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# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

from selenium.webdriver.common import service


class ChromiumService(service.Service):
    """
    Object that manages the starting and stopping the WebDriver instance of the ChromiumDriver
    """

    def __init__(self, executable_path, port=0, service_args=None,
                 log_path=None, env=None, start_error_message=None):
        """
        Creates a new instance of the Service

        :Args:
         - executable_path : Path to the WebDriver executable
         - port : Port the service is running on
         - service_args : List of args to pass to the WebDriver service
         - log_path : Path for the WebDriver service to log to"""

        self.service_args = service_args or []
        if log_path:
            self.service_args.append('--log-path=%s' % log_path)

        if start_error_message is None:
            raise AttributeError("start_error_message should not be empty")

        service.Service.__init__(self, executable_path, port=port, env=env, start_error_message=start_error_message)

    def command_line_args(self):
        return ["--port=%d" % self.port] + self.service_args

This would be better served as a method/property that is set when people don't want to a window.