Make tab audible and muted states and cause available for an extension API

chrome/browser/ui/tabs/tab_strip_model_observer.cc

 // 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.
 
 #include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
 
 using content::WebContents;
 
 void TabStripModelObserver::TabInsertedAt(WebContents* contents,
                                           int index,
@@ skipping 36 matching lines @@
 void TabStripModelObserver::TabReplacedAt(TabStripModel* tab_strip_model,
                                           WebContents* old_contents,
                                           WebContents* new_contents,
                                           int index) {
 }
 
 void TabStripModelObserver::TabPinnedStateChanged(WebContents* contents,
                                                   int index) {
 }
 
+void TabStripModelObserver::TabAudibleStateChanged(WebContents* contents,
+                                    bool audible) {
+
+}
+
+void TabStripModelObserver::TabMutedStateChanged(WebContents* contents,
+                                  bool muted,
+                                  const std::string& cause) {
+
+}
+
 void TabStripModelObserver::TabMiniStateChanged(WebContents* contents,
                                                 int index) {
 }
 
 void TabStripModelObserver::TabBlockedStateChanged(WebContents* contents,
                                                    int index) {
 }
 
 void TabStripModelObserver::TabStripEmpty() {
 }
 
 void TabStripModelObserver::WillCloseAllTabs() {
 }
 
 void TabStripModelObserver::CloseAllTabsCanceled() {
 }
 
 void TabStripModelObserver::TabStripModelDeleted() {
 }