[RPP] More than 2 marker events a the same ts fail

This fixes a small bug where if we have more than 2, rendering the trace breaks.

Bug:None
Change-Id: I8105c126f401f5a7e803c9891bafe08372423e48
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6052257
Commit-Queue: Adriana Ixba <[email protected]>
Reviewed-by: Adam Raine <[email protected]>

Author: Adriana Ixba

front_end/panels/timeline/TimelineFlameChartView.ts

@@ -471,8 +471,8 @@ export class TimelineFlameChartView extends
           parsedTrace.Meta.navigationsByFrameId,
       );
       // If any of the markers overlap in timing, lets put them on the same marker.
-      if (i > 0 && ts === markerOverlays[i - 1].adjustedTimestamp) {
-        markerOverlays[i - 1].entries.push(marker);
+      if (i > 0 && ts === markerOverlays[markerOverlays.length - 1].adjustedTimestamp) {
+        markerOverlays[markerOverlays.length - 1].entries.push(marker);
         return;
       }
       const overlay = {