DevTools: log worker thread ids on the main thread when Timeline recording is enabled

Source/devtools/front_end/sdk/TracingModel.js

 /*
  * Copyright 2014 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
  * @extends {WebInspector.Object}
  * @implements {WebInspector.TargetManager.Observer}
@@ skipping 277 matching lines @@
         if (!this._devtoolsPageMetadataEvents.length) {
             WebInspector.console.error(WebInspector.TracingModel.DevToolsMetadataEvent.TracingStartedInPage + " event not found.");
             return;
         }
         var sessionId = this._devtoolsPageMetadataEvents[0].args["sessionId"];
         this._sessionId = sessionId;
 
         var mismatchingIds = {};
         function checkSessionId(event)
         {
-            var id = event.args["sessionId"];
+            var args = event.args;
+            // FIXME: put sessionId into args["data"] for TracingStartedInPage event.
+            if (args["data"])
+                args = args["data"];
+            var id = args["sessionId"];
             if (id === sessionId)
                 return true;
             mismatchingIds[id] = true;
             return false;
         }
         this._devtoolsPageMetadataEvents = this._devtoolsPageMetadataEvents.filter(checkSessionId);
         this._devtoolsWorkerMetadataEvents = this._devtoolsWorkerMetadataEvents.filter(checkSessionId);
 
         var idList = Object.keys(mismatchingIds);
         if (idList.length)
@@ skipping 381 matching lines @@
  * @param {!WebInspector.TracingModel.Process} process
  * @param {number} id
  */
 WebInspector.TracingModel.Thread = function(process, id)
 {
     WebInspector.TracingModel.NamedObject.call(this);
     this._process = process;
     this._setName("Thread " + id);
     this._events = [];
     this._asyncEvents = [];
+    this._id = id;
 
     this._stack = [];
 }
 
 WebInspector.TracingModel.Thread.prototype = {
 
     /**
      * @return {?WebInspector.Target}
      */
     target: function()
@@ skipping 31 matching lines @@
 
     /**
      * @param {!Array.<!WebInspector.TracingModel.Event>} eventSteps
      */
     _addAsyncEventSteps: function(eventSteps)
     {
         this._asyncEvents.push(eventSteps);
     },
 
     /**
+     * @return {number}
+     */
+    id: function()
+    {
+        return this._id;
+    },
+
+    /**
      * @return {!WebInspector.TracingModel.Process}
      */
     process: function()
     {
         return this._process;
     },
 
     /**
      * @return {!Array.<!WebInspector.TracingModel.Event>}
      */
@@ skipping 44 matching lines @@
     tracingComplete: function()
     {
         this._tracingModel._tracingComplete();
     },
 
     started: function()
     {
         this._tracingModel._tracingStarted();
     }
 }