DRP metrics observer stop observing after hidden

chrome/browser/page_load_metrics/page_load_tracker.cc

 // Copyright 2016 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_tracker.h"
 
 #include <algorithm>
 #include <ostream>
 #include <string>
 #include <utility>
@@ skipping 395 matching lines @@
     background_time_ = base::TimeTicks::Now();
     ClampBrowserTimestampIfInterProcessTimeTickSkew(&background_time_);
     // Though most cases where a tab is backgrounded are user initiated, we
     // can't be certain that we were backgrounded due to a user action. For
     // example, on Android, the screen times out after a period of inactivity,
     // resulting in a non-user-initiated backgrounding.
     const bool abort_is_user_initiated = false;
     NotifyAbort(ABORT_BACKGROUND, abort_is_user_initiated, background_time_,
                 true);
   }
-
-  INVOKE_AND_PRUNE_OBSERVERS(observers_, OnHidden);
+  const PageLoadExtraInfo info = ComputePageLoadExtraInfo();
+  INVOKE_AND_PRUNE_OBSERVERS(observers_, OnHidden, timing_, info);
 }
 
 void PageLoadTracker::WebContentsShown() {
   // Only log the first time we foreground in a given page load.
   if (foreground_time_.is_null()) {
     // Make sure we either started in the background and haven't been
     // backgrounded yet, or started in the foreground and have already been
     // backgrounded.
     DCHECK_NE(started_in_foreground_, background_time_.is_null());
     foreground_time_ = base::TimeTicks::Now();
@@ skipping 237 matching lines @@
   abort_type_ = abort_type;
   abort_time_ = timestamp;
   abort_user_initiated_ = user_initiated && abort_type != ABORT_CLIENT_REDIRECT;
 
   if (is_certainly_browser_timestamp) {
     ClampBrowserTimestampIfInterProcessTimeTickSkew(&abort_time_);
   }
 }
 
 }  // namespace page_load_metrics