Fix aggregated stats caclulation for coalesced records

Source/devtools/front_end/timeline/TimelineView.js

Index: Source/devtools/front_end/timeline/TimelineView.js
diff --git a/Source/devtools/front_end/timeline/TimelineView.js b/Source/devtools/front_end/timeline/TimelineView.js
index 438ea2f5520b2577aaf07ce693b3b1f188b54056..9efe5af0b6edd1afe88e2b29eca611e4cfe20d7f 100644
--- a/Source/devtools/front_end/timeline/TimelineView.js
+++ b/Source/devtools/front_end/timeline/TimelineView.js
@@ -340,7 +340,7 @@ WebInspector.TimelineView.prototype = {
             var aggregatedStats = {};
             var presentationChildren = presentationRecord.presentationChildren();
             for (var i = 0; i < presentationChildren.length; ++i)
-                WebInspector.TimelineUIUtils.aggregateTimeByCategory(aggregatedStats, presentationChildren[i].record().aggregatedStats);
+                WebInspector.TimelineUIUtils.aggregateTimeByCategory(aggregatedStats, presentationChildren[i].record().aggregatedStats());
             var idle = presentationRecord.record().endTime() - presentationRecord.record().startTime();
             for (var category in aggregatedStats)
                 idle -= aggregatedStats[category];