Notify NetworkDelegate when bytes have been sent over the network.

net/base/layered_network_delegate_unittest.cc

Index: net/base/layered_network_delegate_unittest.cc
diff --git a/net/base/layered_network_delegate_unittest.cc b/net/base/layered_network_delegate_unittest.cc
index a74a2b6556c1ac596518a70367e6092a1a1fcf16..477479d7e13aa686ece59c994dd29abfa957040d 100644
--- a/net/base/layered_network_delegate_unittest.cc
+++ b/net/base/layered_network_delegate_unittest.cc
@@ -74,6 +74,11 @@ class TestNetworkDelegateImpl : public NetworkDelegateImpl {
     IncrementAndCompareCounter("on_send_headers_count");
   }
 
+  void OnNetworkBytesSent(const URLRequest& request,
+                          int64_t bytes_sent) override {
+    IncrementAndCompareCounter("on_network_bytes_sent_count");
+  }
+
   int OnHeadersReceived(
       URLRequest* request,
       const CompletionCallback& callback,
@@ -257,6 +262,12 @@ class TestLayeredNetworkDelegate : public LayeredNetworkDelegate {
     EXPECT_EQ(1, (*counters_)["on_send_headers_count"]);
   }
 
+  void OnNetworkBytesSentInternal(const URLRequest& request,
+                                  int64_t bytes_sent) override {
+    ++(*counters_)["on_network_bytes_sent_count"];
+    EXPECT_EQ(1, (*counters_)["on_network_bytes_sent_count"]);
+  }
+
   void OnHeadersReceivedInternal(
       URLRequest* request,
       const CompletionCallback& callback,