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

chrome/browser/ui/views/tabs/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_TAB_STRIP_CONTROLLER_H_
 #define CHROME_BROWSER_UI_VIEWS_TABS_TAB_STRIP_CONTROLLER_H_
 
 #include "base/strings/string16.h"
 #include "chrome/browser/ui/views/tabs/tab_strip_types.h"
 #include "ui/base/ui_base_types.h"
@@ skipping 49 matching lines @@
 
   // Toggles the selection of the specified index in the model.
   virtual void ToggleSelected(int index) = 0;
 
   // Adds the selection the anchor to |index|.
   virtual void AddSelectionFromAnchorTo(int index) = 0;
 
   // Closes the tab at the specified index in the model.
   virtual void CloseTab(int index, CloseTabSource source) = 0;
 
+  // Toggles audio muting for the tab at the specified index in the model.
+  virtual void ToggleTabAudioMute(int index) = 0;
+
   // Shows a context menu for the tab at the specified point in screen coords.
   virtual void ShowContextMenuForTab(Tab* tab,
                                      const gfx::Point& p,
                                      ui::MenuSourceType source_type) = 0;
 
   // Updates the loading animations of all the tabs.
   virtual void UpdateLoadingAnimations() = 0;
 
   // Returns true if the associated TabStrip's delegate supports tab moving or
   // detaching. Used by the Frame to determine if dragging on the Tab
@@ skipping 32 matching lines @@
   // This is also called when the tabs that the user is dragging were detached
   // from this tabstrip but the user is still dragging the tabs.
   virtual void OnStoppedDraggingTabs() = 0;
 
   // Determines if the file type of the URL is supported. Should invoke
   // TabStrip::FileSupported to report the result.
   virtual void CheckFileSupported(const GURL& url) = 0;
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TABS_TAB_STRIP_CONTROLLER_H_