Filter out workers started by other pages when showing Timeline based on trace events

Source/devtools/front_end/timeline/TracingTimelineModel.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
  * @param {!WebInspector.TracingModel} tracingModel
  * @param {!WebInspector.TimelineModel.Filter} recordFilter
  * @extends {WebInspector.TimelineModel}
  */
@@ skipping 194 matching lines @@
     _didStopRecordingJSSamples: function(error, cpuProfile)
     {
         if (error)
             WebInspector.console.error(error);
         this._cpuProfile = cpuProfile;
     },
 
     _didStopRecordingTraceEvents: function()
     {
         this._stopCallbackBarrier = null;
-        var events = this._tracingModel.devtoolsMetadataEvents();
+        var events = this._tracingModel.devtoolsPageMetadataEvents();
+        var workerMetadataEvents = this._tracingModel.devtoolsWorkerMetadataEvents();
         events.sort(WebInspector.TracingModel.Event.compareStartTime);
 
         this._resetProcessingState();
         for (var i = 0, length = events.length; i < length; i++) {
             var event = events[i];
             var process = event.thread.process();
             var startTime = event.startTime;
 
             var endTime = Infinity;
             if (i + 1 < length)
                 endTime = events[i + 1].startTime;
 
-            process.sortedThreads().forEach(this._processThreadEvents.bind(this, startTime, endTime, event.thread));
+            var threads = process.sortedThreads();
+            for (var j = 0; j < threads.length; j++) {
+                var thread = threads[j];
+                if (thread.name() === "WebCore: Worker" && !workerMetadataEvents.some(function(e) { return e.thread === thread; }))
+                    continue;
+                this._processThreadEvents(startTime, endTime, event.thread, thread);
+            }
         }
         this._resetProcessingState();
 
         this._inspectedTargetEvents.sort(WebInspector.TracingModel.Event.compareStartTime);
 
         if (this._cpuProfile) {
             var jsSamples = WebInspector.TimelineJSProfileProcessor.generateTracingEventsFromCpuProfile(this, this._cpuProfile);
             this._inspectedTargetEvents = this._inspectedTargetEvents.mergeOrdered(jsSamples, WebInspector.TracingModel.Event.orderedCompareStartTime);
             this._setMainThreadEvents(this.mainThreadEvents().mergeOrdered(jsSamples, WebInspector.TracingModel.Event.orderedCompareStartTime));
             this._cpuProfile = null;
@@ skipping 756 matching lines @@
     },
 
     _didWriteNextChunk: function(stream)
     {
         if (this._recordIndex === this._payloads.length)
             stream.close();
         else
             this._writeNextChunk(stream);
     }
 }