DevTools: Collect JS samples when recording timeline

Source/devtools/front_end/timeline/TimelineFlameChart.js

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 219 matching lines @@
     _generateJSFrameEvents: function(events)
     {
         function equalFrames(frame1, frame2)
         {
             return frame1.scriptId === frame2.scriptId && frame1.functionName === frame2.functionName;
         }
         function eventEndTime(e)
         {
             return e.endTime || e.startTime + WebInspector.TimelineFlameChartDataProvider.InstantEventVisibleDurationMs;
         }
+        function isJSInvocationEvent(e)
+        {
+            switch (e.name) {
+            case WebInspector.TracingTimelineModel.RecordType.FunctionCall:
+            case WebInspector.TracingTimelineModel.RecordType.EvaluateScript:
+                return true;
+            }
+            return false;
+        }
         var jsFrameEvents = [];
         var stackTraceOpenEvents = [];
+        var currentJSInvocationEndTime = 0;
         var coalesceThresholdMs = WebInspector.TimelineFlameChartDataProvider.JSFrameCoalsceThresholdMs;
         for (var i = 0; i < events.length; ++i) {
             var e = events[i];
-            if (!e.stackTrace || !this._isVisible(e))
+            if (e.startTime >= currentJSInvocationEndTime) {
+                stackTraceOpenEvents.length = 0;
+                currentJSInvocationEndTime = 0;
+            }
+            if (isJSInvocationEvent(e))
+                currentJSInvocationEndTime = e.endTime;
+            if (!currentJSInvocationEndTime)
+                continue;
+            if (!e.stackTrace)
                 continue;
             while (stackTraceOpenEvents.length && eventEndTime(stackTraceOpenEvents.peekLast()) + coalesceThresholdMs <= e.startTime)
                 stackTraceOpenEvents.pop();
             var numFrames = e.stackTrace.length;
             for (var j = 0; j < numFrames && j < stackTraceOpenEvents.length; ++j) {
                 var frame = e.stackTrace[numFrames - 1 - j];
                 if (!equalFrames(frame, stackTraceOpenEvents[j].args.data))
                     break;
                 stackTraceOpenEvents[j].endTime = Math.max(stackTraceOpenEvents[j].endTime, eventEndTime(e));
                 stackTraceOpenEvents[j].duration = stackTraceOpenEvents[j].endTime - stackTraceOpenEvents[j].startTime;
@@ skipping 500 matching lines @@
 /**
   * @constructor
   * @param {!WebInspector.TimelineSelection} selection
   * @param {number} entryIndex
   */
 WebInspector.TimelineFlameChart.Selection = function(selection, entryIndex)
 {
     this.timelineSelection = selection;
     this.entryIndex = entryIndex;
 }