DevTools: follow up to r168484, do not add same parent twice into flame chart.

TBR=loislo

Review URL: https://codereview.chromium.org/180783018

git-svn-id: svn://svn.chromium.org/blink/trunk@168496 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/devtools/front_end/TimelineFlameChart.js

@@ -221,7 +221,7 @@ WebInspector.TimelineFlameChartDataProvider.prototype = {
             this._appendRecord(childRecord, level + 1);
             currentTime = childEndTime;
         }
-        if (recordEndTime !== currentTime || record.children.length === 0)
+        if (recordIndex === -1 && recordEndTime !== currentTime || record.children.length === 0)
             this._pushRecord(record, true, level, currentTime, recordEndTime);
 
         this._maxStackDepth = Math.max(this._maxStackDepth, level + 2);