Notify NetworkDelegate when bytes have been received over the network.

net/base/network_delegate_impl.cc

Index: net/base/network_delegate_impl.cc
diff --git a/net/base/network_delegate_impl.cc b/net/base/network_delegate_impl.cc
index 542b4d02cb9feef8c93fc85c5a075368b43ecee1..858b0050e5c631275068994fac62a6be56e2738d 100644
--- a/net/base/network_delegate_impl.cc
+++ b/net/base/network_delegate_impl.cc
@@ -60,6 +60,9 @@ void NetworkDelegateImpl::OnRawBytesRead(const URLRequest& request,
                                          int bytes_read) {
 }
 
+void NetworkDelegateImpl::OnNetworkBytesReceived(const URLRequest& request,

[bengr, 2015/08/17 21:30:39]

What's the argument for this approach instead of having request own a struct of
data usage statistics?

[sclittle, 2015/08/17 23:35:14]

This is just a way for consumers to be notified how many network bytes were
received, when they're received. We'll probably want to expose some data usage
statistics from the request as well, like GetTotalReceivedBytes() is right now.

The advantage of this style of notification is that consumers are notified when
bytes are read for a request, and they don't have to keep track of and compute
the delta bytes_received for a request in the consumer at each stage in the
request, e.g. between OnHeadersReceived() and OnRawBytesRead().

+                                                 int64 bytes_received) {}
+
 void NetworkDelegateImpl::OnCompleted(URLRequest* request, bool started) {
 }