title: V8Context not created when passing "about:blank" to ChromiumWebBrowser's constructor
body: <p>The steps to reproduce this are very simple. Just download the latest version of CefSharp.WinForms (57.0.0) with nuget, then add a button and this code to a form:</p>
  
  <pre><code>public partial class Form1 : Form
  {
      ChromiumWebBrowser WebBrowser;
  
      public Form1()
      {
          InitializeComponent();
          WebBrowser = new ChromiumWebBrowser("about:blank");
          panel1.Controls.Add(WebBrowser);
          WebBrowser.Dock = DockStyle.Fill;
      }
  
      private void testButton_Click(object sender, EventArgs e)
      {
          MessageBox.Show(WebBrowser.CanExecuteJavascriptInMainFrame.ToString());
      }
  }
  </code></pre>
  
  <p>Then run the application, wait a few seconds to make sure "about:blank" has loaded and press the <code>testButton</code>. The message box will show <code>False</code>. In fact, if I attempt to use <code>EvaluateScriptAsync</code> I will get an exception telling me the context has not been created. </p>
  
  <p>One way to solve this is to call <code>ShowDevTools</code>, which seems to somehow force a context to be created. Another solution is to navigate to a non local page such as Google. In this case, even if I go back to "about:blank" I'll be able to run scripts. I tried using a custom scheme registered with <code>CefSettings.RegisterScheme</code>, but navigating to my custom page still does not create a context (I tried passing "about:blank" to the constructor and then navigating to my custom scheme and the other way around too and none worked).</p>
  
  <p>So, is it possible to have CefSharp create a context without having to navigate to a non-local page or to show DevTools?</p>