Allow dynamic switching in and out of sidetabs mode.

chrome/browser/views/tabs/tab.h

 // Copyright (c) 2010 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_VIEWS_TABS_TAB_H_
 #define CHROME_BROWSER_VIEWS_TABS_TAB_H_
 
 #include "chrome/browser/tabs/tab_strip_model.h"
 #include "chrome/browser/views/tabs/tab_renderer.h"
 
@@ skipping 28 matching lines @@
     // Selects the specified Tab.
     virtual void SelectTab(Tab* tab) = 0;
 
     // Closes the specified Tab.
     virtual void CloseTab(Tab* tab) = 0;
 
     // Returns true if the specified command is enabled for the specified Tab.
     virtual bool IsCommandEnabledForTab(
         TabStripModel::ContextMenuCommand command_id, const Tab* tab) const = 0;
 
+    // Returns true if the specified command is checked for the specified Tab.
+    virtual bool IsCommandCheckedForTab(
+        TabStripModel::ContextMenuCommand command_id, const Tab* tab) const = 0;
+
     // Executes the specified command for the specified Tab.
     virtual void ExecuteCommandForTab(
         TabStripModel::ContextMenuCommand command_id, Tab* tab) = 0;
 
     // Starts/Stops highlighting the tabs that will be affected by the
     // specified command for the specified Tab.
     virtual void StartHighlightTabsForCommand(
         TabStripModel::ContextMenuCommand command_id, Tab* tab) = 0;
     virtual void StopHighlightTabsForCommand(
         TabStripModel::ContextMenuCommand command_id, Tab* tab) = 0;
@@ skipping 64 matching lines @@
   bool closing_;
 
   // If non-null it means we're showing a menu for the tab.
   class TabContextMenuContents;
   scoped_ptr<TabContextMenuContents> context_menu_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(Tab);
 };
 
 #endif  // CHROME_BROWSER_VIEWS_TABS_TAB_H_