DevTools: Use better event titles on timeline tree view.

LayoutTests/inspector/tracing/timeline-js-callstacks.html

Index: LayoutTests/inspector/tracing/timeline-js-callstacks.html
diff --git a/LayoutTests/inspector/tracing/timeline-js-callstacks.html b/LayoutTests/inspector/tracing/timeline-js-callstacks.html
index ad260f916e2031c5c5b1fc4531727d42debe7bc3..5de3b3285939e23ec252088a2a9a83c800afb0ce 100644
--- a/LayoutTests/inspector/tracing/timeline-js-callstacks.html
+++ b/LayoutTests/inspector/tracing/timeline-js-callstacks.html
@@ -444,7 +444,10 @@ function test()
 
     function printProfileTree(padding, node)
     {
-        InspectorTest.addResult("  ".repeat(padding) + node.name + ": " + [node.selfTime, node.totalTime].map(function (t) { return t.toFixed(3); }).join("  "));
+        var name = node.name || (node.event.name === WebInspector.TimelineModel.RecordType.JSFrame
+            ? WebInspector.beautifyFunctionName(node.event.args["data"]["functionName"])
+            : WebInspector.TimelineUIUtils.eventTitle(node.event));
+        InspectorTest.addResult("  ".repeat(padding) + name + ": " + [node.selfTime, node.totalTime].map(function (t) { return t.toFixed(3); }).join("  "));
         (node.children || new Map()).forEach(printProfileTree.bind(null, padding + 1));
     }