DRP metrics observer stop observing after hidden

chrome/browser/page_load_metrics/observers/https_engagement_metrics/https_engagement_page_load_metrics_observer.h

Index: chrome/browser/page_load_metrics/observers/https_engagement_metrics/https_engagement_page_load_metrics_observer.h
diff --git a/chrome/browser/page_load_metrics/observers/https_engagement_metrics/https_engagement_page_load_metrics_observer.h b/chrome/browser/page_load_metrics/observers/https_engagement_metrics/https_engagement_page_load_metrics_observer.h
index 9fa21537d803cb9999d9785fdeaec389902b66ab..0bbb996da802665ef5483fc22925e23af705bf12 100644
--- a/chrome/browser/page_load_metrics/observers/https_engagement_metrics/https_engagement_page_load_metrics_observer.h
+++ b/chrome/browser/page_load_metrics/observers/https_engagement_metrics/https_engagement_page_load_metrics_observer.h
@@ -23,21 +23,23 @@ extern const char kHttpEngagementHistogram[];
 class HttpsEngagementPageLoadMetricsObserver
     : public page_load_metrics::PageLoadMetricsObserver {
  public:
   explicit HttpsEngagementPageLoadMetricsObserver(
       content::BrowserContext* context);
 
   // page_load_metrics::PageLoadMetricsObserver:
   ObservePolicy OnStart(content::NavigationHandle* navigation_handle,
                         const GURL& currently_committed_url,
                         bool started_in_foreground) override;
-  ObservePolicy OnHidden() override;
+  ObservePolicy OnHidden(
+      const page_load_metrics::PageLoadTiming& timing,
+      const page_load_metrics::PageLoadExtraInfo& extra_info) override;
   ObservePolicy OnShown() override;
   void OnComplete(
       const page_load_metrics::PageLoadTiming& timing,
       const page_load_metrics::PageLoadExtraInfo& extra_info) override;
 
  private:
   bool currently_in_foreground_;
   base::TimeDelta foreground_time_;
   base::TimeTicks last_time_shown_;
   HttpsEngagementService* engagement_service_;