DevTools: make console.timeline/timelineEnd work for tracing based Timeline

Source/devtools/front_end/timeline/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
  */
 WebInspector.TracingModel = function()
@@ skipping 615 matching lines @@
     _addAsyncEvent: function(payload)
     {
         var phase = WebInspector.TracingModel.Phase;
         var timestamp = payload.ts / 1000;
         var key = payload.name + "." + payload.id;
         var steps = this._openAsyncEvents[key];
 
         var thread = this.threadById(payload.tid);
         if (payload.ph === phase.AsyncBegin) {
             if (steps) {
-                console.error("Event " + key + " at " + timestamp + " was already started at " + steps[0].startTime);
+                console.error("Event " + payload.name + " was already started");

[alph, 2014/09/23 16:02:07]

has already been?

[yurys, 2014/09/23 16:13:28]

Done.

                 return;
             }
             steps = [WebInspector.TracingModel.Event.fromPayload(payload, thread)];
             this._openAsyncEvents[key] = steps;
             thread._addAsyncEventSteps(steps);
             return;
         }
         if (!steps) {
-            console.error("Unexpected async event, phase " + payload.ph + " at " + timestamp);
+            console.error("Unexpected async event " + payload.name + ", phase " + payload.ph);
             return;
         }
         var newEvent = WebInspector.TracingModel.Event.fromPayload(payload, thread);
         if (payload.ph === phase.AsyncEnd) {
             steps.push(newEvent);
             delete this._openAsyncEvents[key];
         } else if (payload.ph === phase.AsyncStepInto || payload.ph === phase.AsyncStepPast) {
             var lastPhase = steps.peekLast().phase;
             if (lastPhase !== phase.AsyncBegin && lastPhase !== payload.ph) {
                 console.assert(false, "Async event step phase mismatch: " + lastPhase + " at " + steps.peekLast().startTime + " vs. " + payload.ph + " at " + timestamp);
@@ skipping 131 matching lines @@
     /**
      * @return {!Array.<!WebInspector.TracingModel.Event>}
      */
     asyncEvents: function()
     {
         return this._asyncEvents;
     },
 
     __proto__: WebInspector.TracingModel.NamedObject.prototype
 }