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

chrome/browser/page_load_metrics/page_load_tracker.cc

Index: chrome/browser/page_load_metrics/page_load_tracker.cc
diff --git a/chrome/browser/page_load_metrics/page_load_tracker.cc b/chrome/browser/page_load_metrics/page_load_tracker.cc
index f3703a0ad2bb26caf672e585b0d54c5ab27c0344..a665847033d5ae643d2d258b3c4b8b8334c21034 100644
--- a/chrome/browser/page_load_metrics/page_load_tracker.cc
+++ b/chrome/browser/page_load_metrics/page_load_tracker.cc
@@ -614,10 +614,17 @@ void PageLoadTracker::UpdateTiming(const PageLoadTiming& new_timing,
   }
 }
 
+void PageLoadTracker::OnStartedResource(
+    const ExtraRequestStartInfo& extra_request_start_info) {
+  for (const auto& observer : observers_) {
+    observer->OnStartedResource(extra_request_start_info);
+  }
+}
+
 void PageLoadTracker::OnLoadedResource(
-    const ExtraRequestInfo& extra_request_info) {
+    const ExtraRequestCompleteInfo& extra_request_complete_info) {
   for (const auto& observer : observers_) {
-    observer->OnLoadedResource(extra_request_info);
+    observer->OnLoadedResource(extra_request_complete_info);
   }
 }