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

chrome/common/chrome_switches.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.
 
 // Defines all the command-line switches used by Chrome.
 
 #ifndef CHROME_COMMON_CHROME_SWITCHES_H_
 #define CHROME_COMMON_CHROME_SWITCHES_H_
 
 #include "build/build_config.h"
@@ skipping 159 matching lines @@
 extern const char kDisableSettingsWindow[];
 extern const char kEnableSpdy4[];
 extern const char kEnableSpellingAutoCorrect[];
 extern const char kEnableSpellingFeedbackFieldTrial[];
 extern const char kEnableSSLConnectJobWaiting[];
 extern const char kEnableStreamlinedHostedApps[];
 extern const char kEnableSuggestionsService[];
 extern const char kEnableSupervisedUserBlacklist[];
 extern const char kEnableSyncArticles[];
 extern const char kEnableSyncSyncedNotifications[];
+extern const char kEnableTabAudioMuting[];
 extern const char kEnableThumbnailRetargeting[];
 extern const char kEnableTranslateNewUX[];
 extern const char kEnableUserAlternateProtocolPorts[];
 extern const char kEnableWebSocketOverSpdy[];
 extern const char kEnableWebsiteSettingsManager[];
 extern const char kEnhancedBookmarksExperiment[];
 extern const char kExplicitlyAllowedPorts[];
 extern const char kExtensionContentVerificationBootstrap[];
 extern const char kExtensionContentVerificationEnforceStrict[];
 extern const char kExtensionContentVerificationEnforce[];
@@ skipping 208 matching lines @@
 
 bool AboutInSettingsEnabled();
 bool SettingsWindowEnabled();
 
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).
 
 }  // namespace switches
 
 #endif  // CHROME_COMMON_CHROME_SWITCHES_H_