Show media and VTT text tracks in the devtools.

Source/devtools/front_end/NetworkManager.js

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 78 matching lines @@
     "text/ecmascript":             {"script": true},
     "application/javascript":      {"script": true},
     "application/ecmascript":      {"script": true},
     "application/x-javascript":    {"script": true},
     "application/json":            {"script": true},
     "text/javascript1.1":          {"script": true},
     "text/javascript1.2":          {"script": true},
     "text/javascript1.3":          {"script": true},
     "text/jscript":                {"script": true},
     "text/livescript":             {"script": true},
+    "text/vtt":                    {"texttrack": true},
 }
 
 WebInspector.NetworkManager.prototype = {
     /**
      * @param {string} url
      * @return {!WebInspector.NetworkRequest}
      */
     inflightRequestForURL: function(url)
     {
         return this._dispatcher._inflightRequestsByURL[url];
@@ skipping 103 matching lines @@
         // as it's going to be an error message. We do not want to emit a warning
         // for this, though, as this will already be reported as resource loading failure.
         // Also, if a URL like http://localhost/wiki/load.php?debug=true&lang=en produces text/css and gets reloaded,
         // it is 304 Not Modified and its guessed mime-type is text/php, which is wrong.
         // Don't check for mime-types in 304-resources.
         if (networkRequest.hasErrorStatusCode() || networkRequest.statusCode === 304 || networkRequest.statusCode === 204)
             return true;
 
         if (typeof networkRequest.type === "undefined"
             || networkRequest.type === WebInspector.resourceTypes.Other
+            || networkRequest.type === WebInspector.resourceTypes.Media
             || networkRequest.type === WebInspector.resourceTypes.XHR
             || networkRequest.type === WebInspector.resourceTypes.WebSocket)
             return true;
 
         if (!networkRequest.mimeType)
             return true; // Might be not known for cached resources with null responses.
 
         if (networkRequest.mimeType in WebInspector.NetworkManager._MIMETypes)
             return networkRequest.type.name() in WebInspector.NetworkManager._MIMETypes[networkRequest.mimeType];
 
@@ skipping 315 matching lines @@
         var networkRequest = new WebInspector.NetworkRequest(this._manager._target, requestId, url, documentURL, frameId, loaderId);
         networkRequest.initiator = initiator;
         return networkRequest;
     }
 }
 
 /**
  * @type {!WebInspector.NetworkManager}
  */
 WebInspector.networkManager;