@@ -24,4 +24,7 @@ final class ChromeDriverCommand {
   private ChromeDriverCommand() {}
 
   static final String LAUNCH_APP = "launchApp";
+  static final String SEND_COMMANDS_FOR_DOWNLOAD_CHROME_HEAD_LESS
+      = "sendCommandForDownloadChromeHeadLess";
+
 }
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// to you under the Apache License, Version 2.0 (the
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// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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// software distributed under the License is distributed on an
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package org.openqa.selenium.chrome;

/**
 * Constants for the ChromeDriver specific command IDs.
 */
final class ChromeDriverCommand {
  private ChromeDriverCommand() {}

  static final String LAUNCH_APP = "launchApp";
}

Nit: `Headless` is one word, not two, and so doesn't need camelcasing in this way.