DRP metrics observer stop observing after hidden

chrome/browser/page_load_metrics/page_load_metrics_observer.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/page_load_metrics/page_load_metrics_observer.h"
 
 namespace page_load_metrics {
 
 PageLoadExtraInfo::PageLoadExtraInfo(
     const base::Optional<base::TimeDelta>& first_background_time,
@@ skipping 41 matching lines @@
 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,
     const PageLoadExtraInfo& extra_info) {
   return CONTINUE_OBSERVING;
 }
 
 }  // namespace page_load_metrics