[Console Insights Teasers] UMA for teaser generation time

Bug: 443644665
Change-Id: Id0a8ca6f8fa5b97371d2d3362cdeacf6d4129966
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/7079053
Auto-Submit: Wolfgang Beyer <wolfi@chromium.org>
Commit-Queue: Wolfgang Beyer <wolfi@chromium.org>
Commit-Queue: Alex Rudenko <alexrudenko@chromium.org>
Reviewed-by: Alex Rudenko <alexrudenko@chromium.org>

Author: wolfib

front_end/core/host/UserMetrics.ts

@@ -312,6 +312,11 @@ export class UserMetrics {
     InspectorFrontendHostInstance.recordEnumeratedHistogram(
         EnumeratedHistogram.BuiltInAiAvailability, availability, BuiltInAiAvailability.MAX_VALUE);
   }
+
+  consoleInsightTeaserGenerated(timeInMilliseconds: number): void {
+    InspectorFrontendHostInstance.recordPerformanceHistogram(
+        'DevTools.Insights.TeaserGenerationTime', timeInMilliseconds);
+  }
 }
 
 /**

front_end/panels/console/ConsoleInsightTeaser.ts

@@ -346,6 +346,7 @@ export class ConsoleInsightTeaser extends UI.Widget.Widget {
     this.#headerText = this.#consoleViewMessage.toMessageTextString().substring(0, 70);
     this.#isGenerating = true;
     this.#timeoutId = setTimeout(this.#setSlow.bind(this), SLOW_GENERATION_CUTOFF_MILLISECONDS);
+    const startTime = performance.now();
     let teaserText = '';
     try {
       for await (const chunk of this.#getOnDeviceInsight()) {
@@ -366,6 +367,7 @@ export class ConsoleInsightTeaser extends UI.Widget.Widget {
     }
 
     clearTimeout(this.#timeoutId);
+    Host.userMetrics.consoleInsightTeaserGenerated(performance.now() - startTime);
     this.#isGenerating = false;
     this.#mainText = teaserText;
     this.requestUpdate();