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

chrome/browser/page_load_metrics/observers/subresource_filter_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/subresource_filter_metrics_observer.h"
 
 #include "chrome/browser/page_load_metrics/page_load_metrics_util.h"
 #include "components/subresource_filter/content/browser/content_subresource_filter_driver_factory.h"
 #include "third_party/WebKit/public/platform/WebLoadingBehaviorFlag.h"
 
@@ skipping 150 matching lines @@
   return CONTINUE_OBSERVING;
 }
 
 void SubresourceFilterMetricsObserver::OnComplete(
     const page_load_metrics::PageLoadTiming& timing,
     const page_load_metrics::PageLoadExtraInfo& info) {
   OnGoingAway(timing, info, base::TimeTicks());
 }
 
 void SubresourceFilterMetricsObserver::OnLoadedResource(
-    const page_load_metrics::ExtraRequestInfo& extra_request_info) {
+    const page_load_metrics::ExtraRequestCompleteInfo& extra_request_info) {
   if (extra_request_info.was_cached) {
     ++num_cache_resources_;
     cache_bytes_ += extra_request_info.raw_body_bytes;
   } else {
     ++num_network_resources_;
     network_bytes_ += extra_request_info.raw_body_bytes;
   }
 }
 
 void SubresourceFilterMetricsObserver::OnParseStop(
@@ skipping 174 matching lines @@
     PAGE_LOAD_LONG_HISTOGRAM(
         internal::kHistogramSubresourceFilterForegroundDuration,
         foreground_duration.value());
     if (timing.first_paint && timing.first_paint < foreground_duration) {
       PAGE_LOAD_LONG_HISTOGRAM(
           internal::kHistogramSubresourceFilterForegroundDurationAfterPaint,
           foreground_duration.value() - timing.first_paint.value());
     }
   }
 }