linux-aura: Restore middle-click on new-tab button behaviour.

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_
 
 #include <vector>
 
 #include "content/public/common/page_transition_types.h"
 
 class Browser;
 class DockInfo;
+class GURL;
 
 namespace content {
 class WebContents;
 }
 
 namespace gfx {
 class Rect;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
@@ skipping 16 matching lines @@
   };
 
   enum RestoreTabType {
     RESTORE_NONE,
     RESTORE_TAB,
     RESTORE_WINDOW
   };
 
   virtual ~TabStripModelDelegate() {}
 
-  // Adds what the delegate considers to be a blank tab to the model. An |index|
-  // value of -1 means to append the contents to the end of the tab strip.
-  virtual void AddBlankTabAt(int index, bool foreground) = 0;
+  // Adds a tab to the model and loads |url| in the tab. If |url| is an empty
+  // URL, then the new tab-page is loaded instead. An |index| value of -1
+  // means to append the contents to the end of the tab strip.
+  virtual void AddURLTabAt(const GURL& url, int index, bool foreground) = 0;
 
   // Asks for a new TabStripModel to be created and the given web contentses to
   // be added to it. Its size and position are reflected in |window_bounds|.
   // If |dock_info|'s type is other than NONE, the newly created window should
   // be docked as identified by |dock_info|. Returns the Browser object
   // representing the newly created window and tab strip. This does not
   // show the window; it's up to the caller to do so.
   //
   // TODO(avi): This is a layering violation; the TabStripModel should not know
   // about the Browser type. At least fix so that this returns a
@@ skipping 49 matching lines @@
 
   // Returns true if we should allow "bookmark all tabs" in this window; this is
   // true when there is more than one bookmarkable tab open.
   virtual bool CanBookmarkAllTabs() const = 0;
 
   // Creates a bookmark folder containing a bookmark for all open tabs.
   virtual void BookmarkAllTabs() = 0;
 };
 
 #endif  // CHROME_BROWSER_UI_TABS_TAB_STRIP_MODEL_DELEGATE_H_