title: Arguments not being applied to Google chromedriver in Selenium with python
body: <p>I'm using selenium with python and chromedriver (webdriver) on OS X (Yosemite)</p>
  
  <p>I'm trying to add arguments to my driver instance like so:</p>
  
  <pre><code>from selenium import webdriver
  from selenium.webdriver.chrome.options import Options
  
  chrome_options = webdriver.ChromeOptions()
  chrome_options.add_argument('--start-maximized')
  webdriver.Chrome(executable_path='/Library/Python/2.7/site-packages/selenium/webdriver/chrome/chromedriver', chrome_options=chrome_options)
  </code></pre>
  
  <p>The browser window creates fine but it doesn't maximise.</p>
  
  <p>Even ignoring that particular argument, no matter which arguments I supply they never seem to be applied. Am I missing something?</p>
  
  <p><strong>Edit:</strong> Seems I can pass the mobile emulation options without any problems. So the issue might be contained to passing argument type options. </p>