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

chrome/browser/content_settings/host_content_settings_map.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/content_settings/host_content_settings_map.h"
 
 #include <utility>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
@@ skipping 363 matching lines @@
     return true;
   }
   switch (content_type) {
     case CONTENT_SETTINGS_TYPE_COOKIES:
       return setting == CONTENT_SETTING_SESSION_ONLY;
     case CONTENT_SETTINGS_TYPE_PLUGINS:
     case CONTENT_SETTINGS_TYPE_GEOLOCATION:
     case CONTENT_SETTINGS_TYPE_NOTIFICATIONS:
     case CONTENT_SETTINGS_TYPE_INTENTS:
     case CONTENT_SETTINGS_TYPE_MOUSELOCK:
+    case CONTENT_SETTINGS_TYPE_MEDIASTREAM:
       return setting == CONTENT_SETTING_ASK;
     default:
       return false;
   }
 }
 
 void HostContentSettingsMap::OnContentSettingChanged(
     const ContentSettingsPattern& primary_pattern,
     const ContentSettingsPattern& secondary_pattern,
     ContentSettingsType content_type,
@@ skipping 156 matching lines @@
     }
   }
 
   if (info) {
     info->source = content_settings::SETTING_SOURCE_NONE;
     info->primary_pattern = ContentSettingsPattern();
     info->secondary_pattern = ContentSettingsPattern();
   }
   return NULL;
 }