Also load gtags.el with helm-gtags.

Author: xendk

drupal-mode.el

@@ -872,6 +872,7 @@ mode-hook."
 (eval-after-load 'eldoc '(require 'drupal/eldoc))
 (eval-after-load 'etags '(require 'drupal/etags))
 (eval-after-load 'gtags '(require 'drupal/gtags))
+(eval-after-load 'helm-gtags '(require 'drupal/gtags))
 (eval-after-load 'ggtags '(require 'drupal/ggtags))
 (eval-after-load 'ispell '(require 'drupal/ispell))
 (eval-after-load 'flymake-phpcs '(require 'drupal/flymake-phpcs))