DevTools: adopt existing Timeline tests for tracing based Timeline

LayoutTests/http/tests/inspector/timeline-test.js

 var initialize_Timeline = function() {
 
 // Scrub values when printing out these properties in the record or data field.
 InspectorTest.timelinePropertyFormatters = {
     children: "formatAsTypeName",
     endTime: "formatAsTypeName",
     requestId: "formatAsTypeName",
     startTime: "formatAsTypeName",
     stackTrace: "formatAsTypeName",
     url: "formatAsURL",
     scriptName: "formatAsTypeName",
     scriptId: "formatAsTypeName",
     usedHeapSizeDelta: "skip",
     mimeType: "formatAsTypeName",
     id: "formatAsTypeName",
     timerId: "formatAsTypeName",
     scriptLine: "formatAsTypeName",
     layerId: "formatAsTypeName",
     lineNumber: "formatAsTypeName",
     columnNumber: "formatAsTypeName",
     frameId: "formatAsTypeName",
+    frame: "formatAsTypeName",
     encodedDataLength: "formatAsTypeName",
     identifier: "formatAsTypeName",
     clip: "formatAsTypeName",
     root: "formatAsTypeName",
     backendNodeId: "formatAsTypeName",
+    nodeId: "formatAsTypeName",
+    rootNode: "formatAsTypeName",
     networkTime: "formatAsTypeName",
     thread: "formatAsTypeName"
 };
 
 InspectorTest.timelinePresentationModel = function()
 {
     return WebInspector.panels.timeline._currentViews[0]._presentationModel;
 }
 
 InspectorTest.timelineModel = function()
@@ skipping 207 matching lines @@
     var object = {};
     var names = ["data", "endTime", "frameId", "stackTrace", "startTime", "thread", "type"];
     for (var i = 0; i < names.length; i++) {
         var name = names[i];
         var value = record[name].call(record)
         if (value)
             object[name] = value;
     }
     if (record.children().length)
         object["children"] = [];
+    if (!record.data() && record instanceof WebInspector.TracingTimelineModel.TraceEventRecord)
+        object["data"] = record.traceEvent().args;
     InspectorTest.addObject(object, InspectorTest.timelinePropertyFormatters);
 };
 
 InspectorTest.findFirstTimelineRecord = function(type)
 {
     var result;
     function findByType(record)
     {
         if (record.type() !== type)
             return false;
@@ skipping 70 matching lines @@
         return this._fileSize;
     },
 
     fileName: function()
     {
         return "fakeFile";
     }
 };
 
 };