Attempt 2 at enabling a tab dragging test

chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.h

Index: chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.h
diff --git a/chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.h b/chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.h
index 41e037e84dbf2f5cb9f485d205de1f80d054a752..9f42f95c8332e36c68303facb2cfa97bc14073ef 100644
--- a/chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.h
+++ b/chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.h
@@ -51,6 +51,10 @@ class TabDragControllerTest : public InProcessBrowserTest {
 
   const BrowserList* browser_list;
 
+ protected:
+  // InProcessBrowserTest:
+  void SetUpCommandLine(base::CommandLine* command_line) override;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(TabDragControllerTest);
 };