Use isProgram method to detect Program events

Source/devtools/front_end/timeline/TracingTimelineModel.js

Index: Source/devtools/front_end/timeline/TracingTimelineModel.js
diff --git a/Source/devtools/front_end/timeline/TracingTimelineModel.js b/Source/devtools/front_end/timeline/TracingTimelineModel.js
index 77d227d97e2f631d4d44f34f578983053ba893a8..956fcd57b0cdebc86ba016e8b0ce3af249b63eae 100644
--- a/Source/devtools/front_end/timeline/TracingTimelineModel.js
+++ b/Source/devtools/front_end/timeline/TracingTimelineModel.js
@@ -613,6 +613,14 @@ WebInspector.TracingTimelineModel.TraceEventRecord.prototype = {
     },
 
     /**
+     * @return {boolean}
+     */
+    isProgram: function()
+    {
+        return this.type() === WebInspector.TracingTimelineModel.RecordType.Program;
+    },
+
+    /**
      * @return {?Object}
      */
     highlightQuad: function()