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

chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.cc

Index: chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.cc
diff --git a/chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.cc b/chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.cc
index 4dafee81b58dd5d02c4d83ff032183716508b091..11b47e010f9e60e545bceecdd9ca0896784fc0aa 100644
--- a/chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.cc
+++ b/chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.cc
@@ -418,16 +418,18 @@ void DataReductionProxyMetricsObserver::OnParseStop(
 }
 
 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*