chrome.audio API: treat mute as system wide property

extensions/browser/api/audio/audio_api.h

 // Copyright (c) 2013 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 EXTENSIONS_BROWSER_API_AUDIO_AUDIO_API_H_
 #define EXTENSIONS_BROWSER_API_AUDIO_AUDIO_API_H_
 
 #include "extensions/browser/api/audio/audio_service.h"
 #include "extensions/browser/browser_context_keyed_api_factory.h"
 #include "extensions/browser/extension_function.h"
@@ skipping 50 matching lines @@
 
 class AudioSetPropertiesFunction : public UIThreadExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("audio.setProperties", AUDIO_SETPROPERTIES);
 
  protected:
   ~AudioSetPropertiesFunction() override {}
   ResponseAction Run() override;
 };
 
+class AudioSetMuteFunction : public UIThreadExtensionFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION("audio.setMute", AUDIO_SETMUTE);
+
+ protected:
+  ~AudioSetMuteFunction() override {}
+  ResponseAction Run() override;
+};
+
+class AudioGetMuteFunction : public UIThreadExtensionFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION("audio.getMute", AUDIO_GETMUTE);
+
+ protected:
+  ~AudioGetMuteFunction() override {}
+  ResponseAction Run() override;
+};
+
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_AUDIO_AUDIO_API_H_