Notify NetworkDelegate when bytes have been received over the network.

net/base/network_delegate_impl.h

Index: net/base/network_delegate_impl.h
diff --git a/net/base/network_delegate_impl.h b/net/base/network_delegate_impl.h
index 1f1c779d2d9e88f95bbb251bb4a8e2de32376436..b5e97ce8c3c11df25265d172cf8e7326aedcdb75 100644
--- a/net/base/network_delegate_impl.h
+++ b/net/base/network_delegate_impl.h
@@ -118,6 +118,14 @@ class NET_EXPORT NetworkDelegateImpl : public NetworkDelegate {
   // Called every time we read raw bytes.
   void OnRawBytesRead(const URLRequest& request, int bytes_read) override;
 
+  // Called when bytes are received from the network, such as after receiving
+  // headers or reading raw response bytes. |bytes_received| is the number of
+  // bytes measured at the application layer that have been received over the
+  // network since the last time OnNetworkBytesReceived was called.
+  // |bytes_received| will always be greater than 0.
+  void OnNetworkBytesReceived(const URLRequest& request,
+                              int64 bytes_received) override;
+
   // Indicates that the URL request has been completed or failed.
   // |started| indicates whether the request has been started. If false,
   // some information like the socket address is not available.