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..7a2318899396d99f87e537fa9346838016ddd447 100644
--- a/net/base/network_delegate_impl.h
+++ b/net/base/network_delegate_impl.h
@@ -5,6 +5,8 @@
 #ifndef NET_BASE_NETWORK_DELEGATE_IMPL_H_
 #define NET_BASE_NETWORK_DELEGATE_IMPL_H_
 
+#include <stdint.h>
+
 #include "base/strings/string16.h"
 #include "net/base/completion_callback.h"
 #include "net/base/network_delegate.h"
@@ -115,8 +117,16 @@ class NET_EXPORT NetworkDelegateImpl : public NetworkDelegate {
   // This corresponds to URLRequestDelegate::OnResponseStarted.
   void OnResponseStarted(URLRequest* request) override;
 
-  // 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. This includes localhost requests.
+  // |bytes_received| is the number of bytes measured at the application layer
+  // that have been received over the network for this request since the last
+  // time OnNetworkBytesReceived was called. |bytes_received| will always be
+  // greater than 0.
+  // Currently, this is only implemented for HTTP transactions, and
+  // |bytes_received| does not include TLS overhead or TCP retransmits.
+  void OnNetworkBytesReceived(const URLRequest& request,
+                              int64_t bytes_received) override;
 
   // Indicates that the URL request has been completed or failed.
   // |started| indicates whether the request has been started. If false,