Implementation for switching between recently used tabs using ctrl tilde or quoteleft.

chrome/browser/ui/tabs/tab_mru_list_manager.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_MRU_LIST_MANAGER_H_
+#define CHROME_BROWSER_UI_TABS_TAB_MRU_LIST_MANAGER_H_
+#pragma once
+
+#include <list>
+
+#include "base/basictypes.h"
+#include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
+
+class TabContentsWrapper;
+////////////////////////////////////////////////////////////////////////////////
+//
+// TabMRUListManager
+//
+// This is a list that manages the tabs that are in a tab strip as per the most
+// recently used priority order. This overrides TabStrip Model Observer.
+//
+////////////////////////////////////////////////////////////////////////////////
+class TabMRUListManager : public TabStripModelObserver {
+ public:
+  TabMRUListManager();
+  virtual ~TabMRUListManager();
+
+  // Overridden from TabStripModelObserver:
+  virtual void TabInsertedAt(TabContentsWrapper* contents,
+                             int index,
+                             bool foreground);

[sky, 2012/05/29 19:48:28]

OVERRIDE on all of these.

[NaveenBobbili (Motorola), 2012/06/05 05:34:16]

Done.

+  virtual void TabClosingAt(TabStripModel* tab_strip_model,
+                            TabContentsWrapper* contents,
+                            int index);
+  virtual void TabDetachedAt(TabContentsWrapper* contents, int index);
+  virtual void ActiveTabChanged(TabContentsWrapper* old_contents,
+                                TabContentsWrapper* new_contents,
+                                int index,
+                                bool user_gesture);
+  virtual void TabReplacedAt(TabStripModel* tab_strip_model,
+                             TabContentsWrapper* old_contents,
+                             TabContentsWrapper* new_contents,
+                             int index);
+  virtual void TabStripEmpty();
+
+  // Public Methods

[sky, 2012/05/29 19:48:28]

Move GetNextMRUTab above TabInsertedTab and add a description. Its in the public
section, so no need to say 'Public Methods.'

[NaveenBobbili (Motorola), 2012/06/05 05:34:16]

Done.

+  TabContentsWrapper* GetNextMRUTab();
+
+ private:
+  // List that maintains the tab indices in the most recently visited order
+  typedef std::list<TabContentsWrapper*> TabsMRUList;
+  TabsMRUList tabs_mru_list_;
+
+  DISALLOW_COPY_AND_ASSIGN(TabMRUListManager);
+};
+
+#endif // CHROME_BROWSER_UI_TABS_TAB_MRU_LIST_MANAGER_H_