Log an immediate variant of FirstContentfulPaint.

components/page_load_metrics/browser/metrics_web_contents_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 "components/page_load_metrics/browser/metrics_web_contents_observer.h"
 
 #include <algorithm>
 #include <string>
 #include <utility>
 
@@ skipping 333 matching lines @@
       timing_.navigation_start.is_null() ||
       timing_.navigation_start == new_timing.navigation_start;
   // Ensure flags sent previously are still present in the new metadata fields.
   bool valid_behavior_descendent =
       (metadata_.behavior_flags & new_metadata.behavior_flags) ==
       metadata_.behavior_flags;
   if (IsValidPageLoadTiming(new_timing) && valid_timing_descendent &&
       valid_behavior_descendent) {
     timing_ = new_timing;
     metadata_ = new_metadata;
+    const PageLoadExtraInfo info = GetPageLoadMetricsInfo();
+    for (const auto& observer : observers_) {
+      observer->OnTimingUpdate(timing_, info);
+    }
     return true;
   }
   return false;
 }
 
 void PageLoadTracker::set_renderer_tracked(bool renderer_tracked) {
   renderer_tracked_ = renderer_tracked;
 }
 
 void PageLoadTracker::AddObserver(
@@ skipping 374 matching lines @@
 
   if (!committed_load_->UpdateTiming(timing, metadata)) {
     // If the page load tracker cannot update its timing, something is wrong
     // with the IPC (it's from another load, or it's invalid in some other way).
     // We expect this to be a rare occurrence.
     RecordInternalError(ERR_BAD_TIMING_IPC);
   }
 }
 
 }  // namespace page_load_metrics