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

chrome/browser/ui/browser_commands.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_BROWSER_COMMANDS_H_
 #define CHROME_BROWSER_UI_BROWSER_COMMANDS_H_
 
 #include <string>
 
 #include "chrome/browser/debugger/devtools_toggle_action.h"
@@ skipping 113 matching lines @@
 void FocusPreviousPane(Browser* browser);
 void ToggleDevToolsWindow(Browser* browser, DevToolsToggleAction action);
 bool CanOpenTaskManager();
 void OpenTaskManager(Browser* browser, bool highlight_background_resources);
 void OpenFeedbackDialog(Browser* browser);
 void ToggleBookmarkBar(Browser* browser);
 void ShowAppMenu(Browser* browser);
 void ShowAvatarMenu(Browser* browser);
 void OpenUpdateChromeDialog(Browser* browser);
 void ToggleSpeechInput(Browser* browser);
+void SelectPreviousMRUTab(Browser* browser);
 void ToggleFullscreenMode(Browser* browser);
 void ClearCache(Browser* browser);
 bool IsDebuggerAttachedToCurrentTab(Browser* browser);
 
 // Opens view-source tab for given tab contents.
 void ViewSource(Browser* browser, TabContents* tab);
 
 // Opens view-source tab for any frame within given tab contents.
 void ViewSource(Browser* browser,
                 TabContents* tab,
                 const GURL& url,
                 const std::string& content_state);
 
 void ViewSelectedSource(Browser* browser);
 bool CanViewSource(const Browser* browser);
 
 void CreateApplicationShortcuts(Browser* browser);
 bool CanCreateApplicationShortcuts(const Browser* browser);
 
 void ConvertTabToAppWindow(Browser* browser, content::WebContents* contents);
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_BROWSER_COMMANDS_H_