Tab audio mute control (views UI), behind a switch (off by default).

chrome/browser/ui/views/tabs/fake_base_tab_strip_controller.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_VIEWS_TABS_FAKE_BASE_TAB_STRIP_CONTROLLER_H_
 #define CHROME_BROWSER_UI_VIEWS_TABS_FAKE_BASE_TAB_STRIP_CONTROLLER_H_
 
 #include "base/compiler_specific.h"
 #include "chrome/browser/ui/views/tabs/tab_strip_controller.h"
 #include "ui/base/models/list_selection_model.h"
@@ skipping 17 matching lines @@
   virtual bool IsActiveTab(int index) const OVERRIDE;
   virtual int GetActiveIndex() const OVERRIDE;
   virtual bool IsTabSelected(int index) const OVERRIDE;
   virtual bool IsTabPinned(int index) const OVERRIDE;
   virtual bool IsNewTabPage(int index) const OVERRIDE;
   virtual void SelectTab(int index) OVERRIDE;
   virtual void ExtendSelectionTo(int index) OVERRIDE;
   virtual void ToggleSelected(int index) OVERRIDE;
   virtual void AddSelectionFromAnchorTo(int index) OVERRIDE;
   virtual void CloseTab(int index, CloseTabSource source) OVERRIDE;
+  virtual void ToggleTabAudioMute(int index) OVERRIDE;
   virtual void ShowContextMenuForTab(Tab* tab,
                                      const gfx::Point& p,
                                      ui::MenuSourceType source_type) OVERRIDE;
   virtual void UpdateLoadingAnimations() OVERRIDE;
   virtual int HasAvailableDragActions() const OVERRIDE;
   virtual void OnDropIndexUpdate(int index, bool drop_before) OVERRIDE;
   virtual void PerformDrop(bool drop_before,
                            int index,
                            const GURL& url) OVERRIDE;
   virtual bool IsCompatibleWith(TabStrip* other) const OVERRIDE;
@@ skipping 10 matching lines @@
 
   int num_tabs_;
   int active_index_;
 
   ui::ListSelectionModel selection_model_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeBaseTabStripController);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TABS_FAKE_BASE_TAB_STRIP_CONTROLLER_H_