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

chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.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/observers/data_reduction_proxy_metrics_observer.h"
 
 #include <string>
 
 #include "base/metrics/histogram_macros.h"
 #include "base/optional.h"
@@ skipping 400 matching lines @@
   base::TimeDelta parse_duration = timing.parse_timing.parse_stop.value() -
                                    timing.parse_timing.parse_start.value();
   RECORD_HISTOGRAMS_FOR_SUFFIX(data_, parse_duration,
                                internal::kHistogramParseDurationSuffix);
   RECORD_HISTOGRAMS_FOR_SUFFIX(
       data_, timing.parse_timing.parse_blocked_on_script_load_duration.value(),
       internal::kHistogramParseBlockedOnScriptLoadSuffix);
 }
 
 void DataReductionProxyMetricsObserver::OnLoadedResource(
-    const page_load_metrics::ExtraRequestInfo& extra_request_info) {
-  if (extra_request_info.was_cached)
+    const page_load_metrics::ExtraRequestCompleteInfo&
+        extra_request_complete_info) {
+  if (extra_request_complete_info.was_cached)
     return;
-  original_network_bytes_ += extra_request_info.original_network_content_length;
-  network_bytes_ += extra_request_info.raw_body_bytes;
+  original_network_bytes_ +=
+      extra_request_complete_info.original_network_content_length;
+  network_bytes_ += extra_request_complete_info.raw_body_bytes;
   num_network_resources_++;
-  if (!extra_request_info.data_reduction_proxy_used)
+  if (!extra_request_complete_info.data_reduction_proxy_used)
     return;
   num_data_reduction_proxy_resources_++;
-  network_bytes_proxied_ += extra_request_info.raw_body_bytes;
+  network_bytes_proxied_ += extra_request_complete_info.raw_body_bytes;
 }
 
 DataReductionProxyPingbackClient*
 DataReductionProxyMetricsObserver::GetPingbackClient() const {
   return DataReductionProxyChromeSettingsFactory::GetForBrowserContext(
              browser_context_)
       ->data_reduction_proxy_service()
       ->pingback_client();
 }
 
 }  // namespace data_reduction_proxy