Prepare for new EvaluateScript event coming from V8.

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

 function wrapCallFunctionForTimeline(f)
 {
     var script = document.createElement("script");
     script.textContent = "(" + f.toString() + ")()\n//# sourceURL=wrapCallFunctionForTimeline.js";
     document.body.appendChild(script);
 }
 
 var initialize_Timeline = function() {
 
 InspectorTest.preloadPanel("timeline");
@@ skipping 315 matching lines @@
 
 InspectorTest.printTraceEventPropertiesIfNameMatches = function(set, traceEvent)
 {
     if (set.has(traceEvent.name))
         InspectorTest.printTraceEventProperties(traceEvent);
 }
 
 InspectorTest.printTraceEventProperties = function(traceEvent)
 {
     InspectorTest.addResult(traceEvent.name + " Properties:");
-    var data = traceEvent.args["beginData"] || traceEvent.args["data"];
+    var data = traceEvent.args && (traceEvent.args["beginData"] || traceEvent.args["data"]);

[caseq, 2016/10/14 18:08:44]

This check shouldn't be necessary, we've always got args.

     var frameId = data && data["frame"];
     var object = {
-        data: traceEvent.args["data"] || traceEvent.args,
+        data: traceEvent.args && traceEvent.args["data"] || traceEvent.args,
         endTime: traceEvent.endTime || traceEvent.startTime,
         frameId: frameId,
         stackTrace: traceEvent.stackTrace,
         startTime: traceEvent.startTime,
         type: traceEvent.name,
     };
     for (var field in object) {
         if (object[field] === null || object[field] === undefined)
             delete object[field];
     }
@@ skipping 128 matching lines @@
 function waitForFrame()
 {
     var callback;
     var promise = new Promise((fulfill) => callback = fulfill);
     if (window.testRunner)
         testRunner.capturePixelsAsyncThen(() => window.requestAnimationFrame(callback));
     else
         window.requestAnimationFrame(callback);
     return promise;
 }