[Extension Toolbar] Refactor and finish pop out logic for actions

chrome/browser/ui/toolbar/test_toolbar_actions_bar_helper.h

 // Copyright 2014 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_TOOLBAR_TEST_TOOLBAR_ACTIONS_BAR_HELPER_H_
 #define CHROME_BROWSER_UI_TOOLBAR_TEST_TOOLBAR_ACTIONS_BAR_HELPER_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 
 class Browser;
 class ToolbarActionsBar;
 
 // A cross-platform container that creates and owns a ToolbarActionsBar and the
 // corresponding view.
 class TestToolbarActionsBarHelper {
  public:
   TestToolbarActionsBarHelper() {}
   virtual ~TestToolbarActionsBarHelper() {}
 
-  static scoped_ptr<TestToolbarActionsBarHelper> Create(Browser* browser);
+  // Creates and returns a TestToolbarActionsBarHelper. If |main_bar| is
+  // non-null, the created actions bar will be in overflow mode.
+  static scoped_ptr<TestToolbarActionsBarHelper> Create(
+      Browser* browser,
+      TestToolbarActionsBarHelper* main_bar);
 
   virtual ToolbarActionsBar* GetToolbarActionsBar() = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestToolbarActionsBarHelper);
 };
 
 #endif  // CHROME_BROWSER_UI_TOOLBAR_TEST_TOOLBAR_ACTIONS_BAR_HELPER_H_