Compact Navigation prototype

chrome/browser/tabs/tab_strip_model_observer.h

 // Copyright (c) 2011 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_TABS_TAB_STRIP_MODEL_OBSERVER_H_
 #define CHROME_BROWSER_TABS_TAB_STRIP_MODEL_OBSERVER_H_
 #pragma once
 
 class TabContentsWrapper;
 class TabStripModel;
@@ skipping 109 matching lines @@
 
   // The TabStripModel now no longer has any tabs. The implementer may
   // use this as a trigger to try and close the window containing the
   // TabStripModel, for example...
   virtual void TabStripEmpty();
 
   // Sent when the tabstrip model is about to be deleted and any reference held
   // must be dropped.
   virtual void TabStripModelDeleted();
 
+  // Invoked when an active/selected tab at |index| is selected again (ie - the
+  // active/foreground tab is clicked).
+  virtual void ActiveTabClicked(int index);
+
  protected:
   virtual ~TabStripModelObserver() {}
 };
 
 #endif  // CHROME_BROWSER_TABS_TAB_STRIP_MODEL_OBSERVER_H_