add "always allow" option to the mediastream infobar and allow user to allow/not allow acces to devi

chrome/common/content_settings_types.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_COMMON_CONTENT_SETTINGS_TYPES_H_
 #define CHROME_COMMON_CONTENT_SETTINGS_TYPES_H_
 #pragma once
 
 // A particular type of content to care about.  We give the user various types
 // of controls over each of these.
 enum ContentSettingsType {
   // "DEFAULT" is only used as an argument to the Content Settings Window
   // opener; there it means "whatever was last shown".
   CONTENT_SETTINGS_TYPE_DEFAULT = -1,
   CONTENT_SETTINGS_TYPE_COOKIES = 0,
   CONTENT_SETTINGS_TYPE_IMAGES,
   CONTENT_SETTINGS_TYPE_JAVASCRIPT,
   CONTENT_SETTINGS_TYPE_PLUGINS,
   CONTENT_SETTINGS_TYPE_POPUPS,
   CONTENT_SETTINGS_TYPE_GEOLOCATION,
   CONTENT_SETTINGS_TYPE_NOTIFICATIONS,
   CONTENT_SETTINGS_TYPE_INTENTS,
   CONTENT_SETTINGS_TYPE_AUTO_SELECT_CERTIFICATE,
   CONTENT_SETTINGS_TYPE_FULLSCREEN,
   CONTENT_SETTINGS_TYPE_MOUSELOCK,
   CONTENT_SETTINGS_TYPE_MIXEDSCRIPT,
-  CONTENT_SETTINGS_NUM_TYPES
+  CONTENT_SETTINGS_TYPE_MEDIASTREAM,
+  CONTENT_SETTINGS_NUM_TYPES,
 };
 
 #endif  // CHROME_COMMON_CONTENT_SETTINGS_TYPES_H_