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

chrome/browser/page_load_metrics/observers/media_page_load_metrics_observer.cc

 // 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.
 
 #include "chrome/browser/page_load_metrics/observers/media_page_load_metrics_observer.h"
 
 #include "chrome/browser/page_load_metrics/page_load_metrics_util.h"
 #include "chrome/common/page_load_metrics/page_load_timing.h"
 
 namespace {
 
 const char kHistogramNetworkBytes[] =
     "PageLoad.Clients.MediaPageLoad.Experimental.Bytes.Network";
 const char kHistogramCacheBytes[] =
     "PageLoad.Clients.MediaPageLoad.Experimental.Bytes.Cache";
 const char kHistogramTotalBytes[] =
     "PageLoad.Clients.MediaPageLoad.Experimental.Bytes.Total";
 
 }  // namespace
 
 MediaPageLoadMetricsObserver::MediaPageLoadMetricsObserver()
     : cache_bytes_(0), network_bytes_(0), played_media_(false) {}
 
 MediaPageLoadMetricsObserver::~MediaPageLoadMetricsObserver() = default;
 
 void MediaPageLoadMetricsObserver::OnLoadedResource(
-    const page_load_metrics::ExtraRequestInfo& extra_request_info) {
+    const page_load_metrics::ExtraRequestCompleteInfo& extra_request_info) {
   if (extra_request_info.was_cached) {
     cache_bytes_ += extra_request_info.raw_body_bytes;
   } else {
     network_bytes_ += extra_request_info.raw_body_bytes;
   }
 }
 
 page_load_metrics::PageLoadMetricsObserver::ObservePolicy
 MediaPageLoadMetricsObserver::FlushMetricsOnAppEnterBackground(
     const page_load_metrics::PageLoadTiming& timing,
@@ skipping 24 matching lines @@
   // Track media (audio or video) in all frames of the page load.
   played_media_ = true;
 }
 
 void MediaPageLoadMetricsObserver::RecordByteHistograms() {
   DCHECK(played_media_);
   PAGE_BYTES_HISTOGRAM(kHistogramNetworkBytes, network_bytes_);
   PAGE_BYTES_HISTOGRAM(kHistogramCacheBytes, cache_bytes_);
   PAGE_BYTES_HISTOGRAM(kHistogramTotalBytes, network_bytes_ + cache_bytes_);
 }