server: Restoring HtmlUnitDriver on server, it is used in grid tests as an invisible test browser

Author: barancev

java/server/src/org/openqa/selenium/remote/server/DefaultDriverSessions.java

@@ -61,6 +61,8 @@ public class DefaultDriverSessions implements DriverSessions {
                                      "org.openqa.selenium.safari.SafariDriver"))
       .add(new DefaultDriverProvider(DesiredCapabilities.phantomjs(),
                                      "org.openqa.selenium.phantomjs.PhantomJSDriver"))
+      .add(new DefaultDriverProvider(DesiredCapabilities.htmlUnit(),
+                                     "org.openqa.selenium.htmlunit.HtmlUnitDriver"))
       .build();
 
   public DefaultDriverSessions() {