DevTools: Collect JS samples when recording timeline

Source/devtools/front_end/timeline/TimelineFlameChart.js

Index: Source/devtools/front_end/timeline/TimelineFlameChart.js
diff --git a/Source/devtools/front_end/timeline/TimelineFlameChart.js b/Source/devtools/front_end/timeline/TimelineFlameChart.js
index 2a6572740951905febfcdda1de9cc9648e5e7a92..dd78e3b1b43b9327428b029bed86c500a263d9a9 100644
--- a/Source/devtools/front_end/timeline/TimelineFlameChart.js
+++ b/Source/devtools/front_end/timeline/TimelineFlameChart.js
@@ -237,12 +237,30 @@ WebInspector.TimelineFlameChartDataProvider.prototype = {
         {
             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;

[yurys, 2014/08/01 15:29:17]

This doesn't seem to work well in case of nested JS invocations.

[alph, 2014/08/01 15:44:45]

I plan to address nested invocations in a separate patch.

+            if (!currentJSInvocationEndTime)
+                continue;
+            if (!e.stackTrace)
                 continue;
             while (stackTraceOpenEvents.length && eventEndTime(stackTraceOpenEvents.peekLast()) + coalesceThresholdMs <= e.startTime)
                 stackTraceOpenEvents.pop();