Tabs Extension: Implementation of tabs.duplicate api.

chrome/browser/ui/tabs/tab_strip_model_delegate.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_TABS_TAB_STRIP_MODEL_DELEGATE_H_
 #define CHROME_BROWSER_UI_TABS_TAB_STRIP_MODEL_DELEGATE_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 60 matching lines @@
       Profile* profile,
       content::PageTransition transition,
       bool defer_load,
       content::SiteInstance* instance) const = 0;
 
   // Returns whether some contents can be duplicated.
   virtual bool CanDuplicateContentsAt(int index) = 0;
 
   // Duplicates the contents at the provided index and places it into its own
   // window.
-  virtual void DuplicateContentsAt(int index) = 0;
+  virtual TabContents* DuplicateContentsAt(int index) = 0;
 
   // Called when a drag session has completed and the frame that initiated the
   // the session should be closed.
   virtual void CloseFrameAfterDragSession() = 0;
 
   // Creates an entry in the historical tab database for the specified
   // TabContents.
   virtual void CreateHistoricalTab(TabContents* contents) = 0;
 
   // Runs any unload listeners associated with the specified TabContents
@@ skipping 25 matching lines @@
   virtual bool CanCloseTab() const = 0;
 
   // Returns true if the tab strip can use large icons.
   virtual bool LargeIconsPermitted() const = 0;
 
  protected:
   virtual ~TabStripModelDelegate() {}
 };
 
 #endif  // CHROME_BROWSER_UI_TABS_TAB_STRIP_MODEL_DELEGATE_H_