Add histograms to NetworkChangeNotifier to identify ways to improve interface

net/url_request/url_request.cc

Index: net/url_request/url_request.cc
diff --git a/net/url_request/url_request.cc b/net/url_request/url_request.cc
index 8ea6325d819e072b5ad455b4c68867c90b7fa131..50c728e5caf00cba02eb40b900719453b78abbb1 100644
--- a/net/url_request/url_request.cc
+++ b/net/url_request/url_request.cc
@@ -20,6 +20,7 @@
 #include "net/base/load_flags.h"
 #include "net/base/net_errors.h"
 #include "net/base/net_log.h"
+#include "net/base/network_change_notifier.h"
 #include "net/base/network_delegate.h"
 #include "net/base/ssl_cert_request_info.h"
 #include "net/base/upload_data.h"
@@ -879,6 +880,9 @@ void URLRequest::NotifyReadCompleted(int bytes_read) {
   if (bytes_read <= 0)
     NotifyRequestCompleted();
 
+  // Notify NetworkChangeNotifier that we just received network data

[szym, 2012/08/08 20:41:17]

nit: add '.' at end of sentence. Perhaps explain that this is to measure
performance and add reference to the relevant bug?

[pauljensen, 2012/08/13 15:42:04]

Done.

+  NetworkChangeNotifier::NotifyDataReceived(url());
+
   if (delegate_)
     delegate_->OnReadCompleted(this, bytes_read);