Add a "LoadLog*" parameter to transactions, hostresolver, clientsocketpool.

net/base/load_log.h

+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef NET_BASE_LOAD_LOG_H_
+#define NET_BASE_LOAD_LOG_H_
+
+#include "base/ref_counted.h"
+
+namespace net {
+
+// LoadLog stores profiling information on where time was spent while servicing
+// a request (waiting in queues, resolving hosts, resolving proxy, etc...).
+class LoadLog : public base::RefCounted<LoadLog> {
+ public:
+// TODO(eroman): Add an API similar to:
+//     void TrackEnterState(LoadState state);
+//     void TrackLeaveState(LoadState state);
+//     void Merge(const LoadLog* other);
+};
+
+}  // namespace net
+
+#endif  // NET_BASE_LOAD_LOG_H_