Attempt 2 at enabling a tab dragging test

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

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_TABS_TAB_DRAG_CONTROLLER_INTERACTIVE_UITEST_H_
 #define CHROME_BROWSER_UI_VIEWS_TABS_TAB_DRAG_CONTROLLER_INTERACTIVE_UITEST_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 33 matching lines @@
 
   // Creates a new Browser and resizes |browser()| and the new browser to be
   // side by side.
   Browser* CreateAnotherWindowBrowserAndRelayout();
 
   void SetWindowFinderForTabStrip(TabStrip* tab_strip,
                                   std::unique_ptr<WindowFinder> window_finder);
 
   const BrowserList* browser_list;
 
+ protected:
+  // InProcessBrowserTest:
+  void SetUpCommandLine(base::CommandLine* command_line) override;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(TabDragControllerTest);
 };
 
 namespace test {
 
 // Returns the TabStrip for |browser|.
 TabStrip* GetTabStripForBrowser(Browser* browser);
 
 // Sets the id of |web_contents| to |id|.
 void SetID(content::WebContents* web_contents, int id);
 
 // Resets the ids of all the tabs in |model| starting at |start|. That is, the
 // id of the first tab is set to |start|, the second tab |start + 1| ...
 void ResetIDs(TabStripModel* model, int start);
 
 // Returns a string representation of the ids of the tabs in |model|. Each id
 // is separated by a space.
 std::string IDString(TabStripModel* model);
 
 }  // namespace test
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TABS_TAB_DRAG_CONTROLLER_INTERACTIVE_UITEST_H_