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

chrome/browser/ui/browser.h

Index: chrome/browser/ui/browser.h
diff --git a/chrome/browser/ui/browser.h b/chrome/browser/ui/browser.h
index 46ba61cd7af8162c330ab1cd451aa825a901b08f..4761b4e58392300dbc0764d5ad0e22f3934f4ac2 100644
--- a/chrome/browser/ui/browser.h
+++ b/chrome/browser/ui/browser.h
@@ -65,6 +65,7 @@ class PrefService;
 class Profile;
 class SkBitmap;
 class StatusBubble;
+class TabMRUListManager;
 class TabNavigation;
 class TabStripModel;
 struct WebApplicationInfo;
@@ -519,6 +520,7 @@ class Browser : public TabStripModelDelegate,
   void MoveTabPrevious();
   void SelectNumberedTab(int index);
   void SelectLastTab();
+  void SelectPreviousMRUTab();
   void DuplicateTab();
   void WriteCurrentURLToClipboard();
   void ConvertPopupToTabbedBrowser();
@@ -818,6 +820,10 @@ class Browser : public TabStripModelDelegate,
     return extension_window_controller_.get();
   }
 
+  TabMRUListManager* tab_mru_list_manager() const {
+    return tab_mru_list_manager_.get();
+  }
+
  protected:
   // Wrapper for the factory method in BrowserWindow. This allows subclasses to
   // set their own window.
@@ -1276,6 +1282,8 @@ class Browser : public TabStripModelDelegate,
 
   scoped_ptr<TabStripModel> tab_strip_model_;
 
+  scoped_ptr<TabMRUListManager> tab_mru_list_manager_;
+
   // The CommandUpdater that manages the browser window commands.
   CommandUpdater command_updater_;