Basic HTTP pipelining support

net/base/net_log_event_type_list.h

Index: net/base/net_log_event_type_list.h
diff --git a/net/base/net_log_event_type_list.h b/net/base/net_log_event_type_list.h
index 1547bc8f850ed4b4d1342485987d38de2fc34101..8ebca16a6d8ad1ca439432033a44a65c22f50779 100644
--- a/net/base/net_log_event_type_list.h
+++ b/net/base/net_log_event_type_list.h
@@ -845,6 +845,13 @@ EVENT_TYPE(HTTP_TRANSACTION_READ_BODY)
 // restarting for authentication, on keep alive connections.
 EVENT_TYPE(HTTP_TRANSACTION_DRAIN_BODY_FOR_AUTH_RESTART)
 
+// This event is sent when we try to restart a transaction after an error.
+// The following parameters are attached:
+//   {
+//     "net_error": <The net error code integer for the failure>,
+//   }
+EVENT_TYPE(HTTP_TRANSACTION_RESTART_AFTER_ERROR)
+
 // ------------------------------------------------------------------------
 // SpdySession
 // ------------------------------------------------------------------------