RPP: fix incorrectly formatted aggregate third party time

We incorrectly cast this to microsecs but the values we are reducing are
milliseconds.

Bug: 394651390
Change-Id: I20b514ea3d27b49e1707b0a9358189923199c49b
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6387360
Commit-Queue: Andres Olivares <[email protected]>
Reviewed-by: Andres Olivares <[email protected]>
Auto-Submit: Jack Franklin <[email protected]>

Author: jackfranklin

front_end/panels/timeline/components/insights/ThirdParties.ts

@@ -59,11 +59,10 @@ export class ThirdParties extends BaseInsightComponent<ThirdPartiesInsightModel>
     }),
     createAggregatedTableRow:
         remaining => {
-          const totalMainThreadTime =
-              remaining.reduce((acc, summary) => acc + summary.mainThreadTime, 0) as Trace.Types.Timing.Micro;
+          const totalMainThreadTime = remaining.reduce<Trace.Types.Timing.Milli>(
+              (acc, summary) => Trace.Types.Timing.Milli(acc + summary.mainThreadTime), Trace.Types.Timing.Milli(0));
           return {
-            values:
-                [renderOthersLabel(remaining.length), i18n.TimeUtilities.formatMicroSecondsTime(totalMainThreadTime)],
+            values: [renderOthersLabel(remaining.length), i18n.TimeUtilities.millisToString(totalMainThreadTime)],
             overlays: remaining.flatMap(summary => this.#createOverlaysForSummary(summary) ?? []),
           };
         },