DevTools: [SASS] introduce Gonzales-PE for SCSS parsing

third_party/WebKit/Source/devtools/front_end/common/FormatterWorkerPool.js

 // Copyright 2016 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.
 
 /**
  * @constructor
  */
 WebInspector.FormatterWorkerPool = function()
 {
     this._taskQueue = [];
@@ skipping 41 matching lines @@
     _onWorkerMessage: function(worker, event)
     {
         var task = this._workerTasks.get(worker);
         if (task.isChunked && event.data && !event.data["isLastChunk"]) {
             task.callback(event);
             return;
         }
 
         this._workerTasks.set(worker, null);
         this._processNextTask();
-        task.callback(event);
+        task.callback(event.data ? event : null);
     },
 
     /**
      * @param {!WebInspector.Worker} worker
      * @param {!Event} event
      */
     _onWorkerError: function(worker, event)
     {
         console.error(event);
         var task = this._workerTasks.get(worker);
@@ skipping 44 matching lines @@
 WebInspector.FormatterWorkerPool.Task = function(method, params, callback, isChunked)
 {
     this.method = method;
     this.params = params;
     this.callback = callback;
     this.isChunked = isChunked;
 }
 
 /** @type {!WebInspector.FormatterWorkerPool} */
 WebInspector.formatterWorkerPool;