DRP metrics observer stop observing after hidden

chrome/browser/page_load_metrics/page_load_metrics_observer.h

Index: chrome/browser/page_load_metrics/page_load_metrics_observer.h
diff --git a/chrome/browser/page_load_metrics/page_load_metrics_observer.h b/chrome/browser/page_load_metrics/page_load_metrics_observer.h
index 65271b1f226dae4e7ead5d16ea0b518deb147bef..fd8c8ffb16affce1d782c637335698ae6a6430fd 100644
--- a/chrome/browser/page_load_metrics/page_load_metrics_observer.h
+++ b/chrome/browser/page_load_metrics/page_load_metrics_observer.h
@@ -166,21 +166,22 @@ class PageLoadMetricsObserver {
   // the navigation, but will be destroyed soon after this call. Don't hold a
   // reference to it.
   // Note that this does not get called for same-page navigations.
   // Observers that return STOP_OBSERVING will not receive any additional
   // callbacks, and will be deleted after invocation of this method returns.
   virtual ObservePolicy OnCommit(content::NavigationHandle* navigation_handle);
 
   // OnHidden is triggered when a page leaves the foreground. It does not fire
   // when a foreground page is permanently closed; for that, listen to
   // OnComplete instead.
-  virtual ObservePolicy OnHidden();
+  virtual ObservePolicy OnHidden(const PageLoadTiming& timing,
+                                 const PageLoadExtraInfo& extra_info);
 
   // OnShown is triggered when a page is brought to the foreground. It does not
   // fire when the page first loads; for that, listen for OnStart instead.
   virtual ObservePolicy OnShown();
 
   // The callbacks below are only invoked after a navigation commits, for
   // tracked page loads. Page loads that don't meet the criteria for being
   // tracked at the time a navigation commits will not receive any of the
   // callbacks below.