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

chrome/browser/ui/tabs/tab_strip_model.cc

Index: chrome/browser/ui/tabs/tab_strip_model.cc
diff --git a/chrome/browser/ui/tabs/tab_strip_model.cc b/chrome/browser/ui/tabs/tab_strip_model.cc
index 5fa230a0174e3ee1b4c84045ade31f89bf38709b..4caf68e637d7954d124ab35a594a584ab34ee05f 100644
--- a/chrome/browser/ui/tabs/tab_strip_model.cc
+++ b/chrome/browser/ui/tabs/tab_strip_model.cc
@@ -1038,14 +1038,16 @@ void TabStripModel::ExecuteContextMenuCommand(
 
     case CommandToggleTabAudioMuted: {
       const std::vector<int>& indices = GetIndicesForCommand(context_index);
-      const bool mute = !chrome::AreAllTabsMuted(*this, indices);
-      if (mute)
+      const bool muted = !chrome::AreAllTabsMuted(*this, indices);
+      if (muted)
         content::RecordAction(UserMetricsAction("TabContextMenu_MuteTabs"));
       else
         content::RecordAction(UserMetricsAction("TabContextMenu_UnmuteTabs"));
       for (std::vector<int>::const_iterator i = indices.begin();
            i != indices.end(); ++i) {
-        chrome::SetTabAudioMuted(GetWebContentsAt(*i), mute);
+        chrome::SetTabAudioMuted(GetWebContentsAt(*i),
+                                 muted,
+                                 chrome::kUserMuteToggleCause);
       }
       break;
     }