Devtools: [WIP] Implement enhanced devtools extension language APIs

Source/devtools/front_end/workspace/UISourceCode.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 502 matching lines @@
     isDirty: function()
     {
         return typeof this._workingCopy !== "undefined" || typeof this._workingCopyGetter !== "undefined";
     },
 
     /**
      * @return {string}
      */
     extension: function()
     {
-        var lastIndexOfDot = this._name.lastIndexOf(".");
-        var extension = lastIndexOfDot !== -1 ? this._name.substr(lastIndexOfDot + 1) : "";
-        var indexOfQuestionMark = extension.indexOf("?");
-        if (indexOfQuestionMark !== -1)
-            extension = extension.substr(0, indexOfQuestionMark);
-        return extension;
+        return WebInspector.TextUtils.extension(this._name);
     },
 
     /**
      * @return {?string}
      */
     content: function()
     {
         return this._content;
     },
 
@@ skipping 180 matching lines @@
      * @param {string} query
      * @param {boolean} caseSensitive
      * @param {boolean} isRegex
      * @param {function(!Array.<!WebInspector.ContentProvider.SearchMatch>)} callback
      */
     searchInContent: function(query, caseSensitive, isRegex, callback)
     {
         callback([]);
     }
 }