cocoa: add some tab-manipulation menu items

chrome/browser/ui/tabs/tab_strip_model.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_STRIP_MODEL_H_
 #define CHROME_BROWSER_UI_TABS_TAB_STRIP_MODEL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 393 matching lines @@
   // command applies to all selected tabs.
   void ExecuteContextMenuCommand(int context_index,
                                  ContextMenuCommand command_id);
 
   // Returns a vector of indices of the tabs that will close when executing the
   // command |id| for the tab at |index|. The returned indices are sorted in
   // descending order.
   std::vector<int> GetIndicesClosedByCommand(int index,
                                              ContextMenuCommand id) const;
 
+  // Returns true if 'CommandToggleTabAudioMuted' will mute. |index| is the
+  // index supplied to |ExecuteContextMenuCommand|.
+  bool WillContextMenuMute(int index);
+
   // Returns true if 'CommandTogglePinned' will pin. |index| is the index
   // supplied to |ExecuteContextMenuCommand|.
   bool WillContextMenuPin(int index);
 
   // Convert a ContextMenuCommand into a browser command. Returns true if a
   // corresponding browser command exists, false otherwise.
   static bool ContextMenuCommandToBrowserCommand(int cmd_id, int* browser_cmd);
 
  private:
   class WebContentsData;
@@ skipping 125 matching lines @@
 
   // TODO(sky): remove this; used for debugging 291265.
   bool in_notify_;
 
   base::WeakPtrFactory<TabStripModel> weak_factory_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(TabStripModel);
 };
 
 #endif  // CHROME_BROWSER_UI_TABS_TAB_STRIP_MODEL_H_