DRP metrics observer stop observing after hidden

chrome/browser/page_load_metrics/page_load_metrics_observer.cc

Index: chrome/browser/page_load_metrics/page_load_metrics_observer.cc
diff --git a/chrome/browser/page_load_metrics/page_load_metrics_observer.cc b/chrome/browser/page_load_metrics/page_load_metrics_observer.cc
index bcd61311b8290f8e2bdffbdb2ef58fa1d2af2d37..edbedc7704db6b71e20146c4001334f8dbb906e1 100644
--- a/chrome/browser/page_load_metrics/page_load_metrics_observer.cc
+++ b/chrome/browser/page_load_metrics/page_load_metrics_observer.cc
@@ -52,21 +52,23 @@ PageLoadMetricsObserver::ObservePolicy PageLoadMetricsObserver::OnStart(
 PageLoadMetricsObserver::ObservePolicy PageLoadMetricsObserver::OnRedirect(
     content::NavigationHandle* navigation_handle) {
   return CONTINUE_OBSERVING;
 }
 
 PageLoadMetricsObserver::ObservePolicy PageLoadMetricsObserver::OnCommit(
     content::NavigationHandle* navigation_handle) {
   return CONTINUE_OBSERVING;
 }
 
-PageLoadMetricsObserver::ObservePolicy PageLoadMetricsObserver::OnHidden() {
+PageLoadMetricsObserver::ObservePolicy PageLoadMetricsObserver::OnHidden(
+    const PageLoadTiming& timing,
+    const PageLoadExtraInfo& extra_info) {
   return CONTINUE_OBSERVING;
 }
 
 PageLoadMetricsObserver::ObservePolicy PageLoadMetricsObserver::OnShown() {
   return CONTINUE_OBSERVING;
 }
 
 PageLoadMetricsObserver::ObservePolicy
 PageLoadMetricsObserver::FlushMetricsOnAppEnterBackground(
     const PageLoadTiming& timing,