Notify NetworkDelegate when bytes have been sent over the network.

net/base/network_delegate.cc

Index: net/base/network_delegate.cc
diff --git a/net/base/network_delegate.cc b/net/base/network_delegate.cc
index 745336f14253305d435e55bcf9abc06f86f6c541..b33eb1ab7a16cec86cc68a510d45a75eba8b6698 100644
--- a/net/base/network_delegate.cc
+++ b/net/base/network_delegate.cc
@@ -67,6 +67,13 @@ void NetworkDelegate::NotifySendHeaders(URLRequest* request,
   OnSendHeaders(request, headers);
 }
 
+void NetworkDelegate::NotifyNetworkBytesSent(const URLRequest& request,
+                                             int64_t bytes_sent) {
+  DCHECK(CalledOnValidThread());
+  DCHECK_GT(bytes_sent, 0);
+  OnNetworkBytesSent(request, bytes_sent);
+}
+
 int NetworkDelegate::NotifyHeadersReceived(
     URLRequest* request,
     const CompletionCallback& callback,