DRP metrics observer stop observing after hidden

chrome/browser/page_load_metrics/page_load_metrics_observer.h

 // 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.
 
 #ifndef CHROME_BROWSER_PAGE_LOAD_METRICS_PAGE_LOAD_METRICS_OBSERVER_H_
 #define CHROME_BROWSER_PAGE_LOAD_METRICS_PAGE_LOAD_METRICS_OBSERVER_H_
 
 #include "base/macros.h"
 #include "base/optional.h"
 #include "chrome/common/page_load_metrics/page_load_timing.h"
@@ skipping 155 matching lines @@
   // 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.
 
@@ skipping 73 matching lines @@
   // OnFailedProvisionalLoad is invoked for tracked page loads that did not
   // commit, immediately before the observer is deleted.
   virtual void OnFailedProvisionalLoad(
       const FailedProvisionalLoadInfo& failed_provisional_load_info,
       const PageLoadExtraInfo& extra_info) {}
 };
 
 }  // namespace page_load_metrics
 
 #endif  // CHROME_BROWSER_PAGE_LOAD_METRICS_PAGE_LOAD_METRICS_OBSERVER_H_