Send an event to the page load metrics to track resource starting.

chrome/browser/page_load_metrics/observers/media_page_load_metrics_observer.h

 // Copyright 2017 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_OBSERVERS_MEDIA_PAGE_LOAD_METRICS_OBSERVER_H_
 #define CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_MEDIA_PAGE_LOAD_METRICS_OBSERVER_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
@@ skipping 13 matching lines @@
   MediaPageLoadMetricsObserver();
   ~MediaPageLoadMetricsObserver() override;
 
   // page_load_metrics::PageLoadMetricsObserver:
   void OnComplete(const page_load_metrics::PageLoadTiming& timing,
                   const page_load_metrics::PageLoadExtraInfo& info) override;
   page_load_metrics::PageLoadMetricsObserver::ObservePolicy
   FlushMetricsOnAppEnterBackground(
       const page_load_metrics::PageLoadTiming& timing,
       const page_load_metrics::PageLoadExtraInfo& info) override;
-  void OnLoadedResource(
-      const page_load_metrics::ExtraRequestInfo& extra_request_info) override;
+  void OnLoadedResource(const page_load_metrics::ExtraRequestCompleteInfo&
+                            extra_request_complete_info) override;
   void MediaStartedPlaying(
       const content::WebContentsObserver::MediaPlayerInfo& video_type,
       bool is_in_main_frame) override;
 
  private:
   // Records histograms for byte information.
   void RecordByteHistograms();
 
   // The number of body (not header) prefilter bytes consumed by requests for
   // the page.
   int64_t cache_bytes_;
   int64_t network_bytes_;
 
   // Whether the page load played a media element.
   bool played_media_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaPageLoadMetricsObserver);
 };
 
 #endif  // CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_MEDIA_PAGE_LOAD_METRICS_OBSERVER_H_