[PageLoadMetrics] Record bytes usage per page

chrome/browser/page_load_metrics/metrics_web_contents_observer.cc

Index: chrome/browser/page_load_metrics/metrics_web_contents_observer.cc
diff --git a/chrome/browser/page_load_metrics/metrics_web_contents_observer.cc b/chrome/browser/page_load_metrics/metrics_web_contents_observer.cc
index 571ef104db8367353264a36aaef54403df502d26..9b8328b64a19ff7b657e33167a51b46bbc716705 100644
--- a/chrome/browser/page_load_metrics/metrics_web_contents_observer.cc
+++ b/chrome/browser/page_load_metrics/metrics_web_contents_observer.cc
@@ -178,7 +178,8 @@ void MetricsWebContentsObserver::WillStartNavigationRequest(
 void MetricsWebContentsObserver::OnRequestComplete(
     content::ResourceType resource_type,
     bool was_cached,
-    int net_error) {
+    int net_error,
+    int64_t raw_body_bytes) {
   // For simplicity, only count subresources. Navigations are hard to attribute
   // here because we won't have a committed load by the time data streams in
   // from the IO thread.
@@ -188,7 +189,7 @@ void MetricsWebContentsObserver::OnRequestComplete(
   }
   if (!committed_load_)
     return;
-  committed_load_->OnLoadedSubresource(was_cached);
+  committed_load_->OnLoadedSubresource(was_cached, raw_body_bytes);
 }
 
 const PageLoadExtraInfo