Generalize the net module's LoadLog facility from a passive container, to an event stream (NetLog).

net/base/net_log_event_type_list.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.
 
 // NOTE: No header guards are used, since this file is intended to be expanded
-// directly into load_log.h. DO NOT include this file anywhere else.
+// directly into net_log.h. DO NOT include this file anywhere else.
 
 // --------------------------------------------------------------------------
 // General pseudo-events
 // --------------------------------------------------------------------------
 
 // Something got cancelled (we determine what is cancelled based on the
 // log context around it.)
 EVENT_TYPE(CANCELLED)
 
+// Marks the creation/destruction of a request (URLRequest or SocketStream).
+// In the begin phase of this event, the message will contain a string which
+// is the URL.
+EVENT_TYPE(REQUEST_ALIVE)
+
 // ------------------------------------------------------------------------
 // HostResolverImpl
 // ------------------------------------------------------------------------
 
 // The start/end of a host resolve (DNS) request.
 EVENT_TYPE(HOST_RESOLVER_IMPL)
 
 // The start/end of HostResolver::Observer::OnStartResolution.
 EVENT_TYPE(HOST_RESOLVER_IMPL_OBSERVER_ONSTART)
 
@@ skipping 85 matching lines @@
 
 // The start/end of a client socket pool request for a socket.
 EVENT_TYPE(SOCKET_POOL)
 
 // The request stalled because there are too many sockets in the pool.
 EVENT_TYPE(SOCKET_POOL_STALLED_MAX_SOCKETS)
 
 // The request stalled because there are too many sockets in the group.
 EVENT_TYPE(SOCKET_POOL_STALLED_MAX_SOCKETS_PER_GROUP)
 
+// A backup socket is created due to slow connect
+EVENT_TYPE(SOCKET_BACKUP_CREATED)
+
+// A backup socket is created due to slow connect
+EVENT_TYPE(SOCKET_BACKUP_TIMER_EXTENDED)
+
+// Identifies the NetLog::Source() for the ConnectJob that this socket ended
+// up binding to.
+EVENT_TYPE(SOCKET_POOL_CONNECT_JOB_ID)
+
 // ------------------------------------------------------------------------
 // URLRequest
 // ------------------------------------------------------------------------
 
 // Measures the time between URLRequest::Start() and
 // URLRequest::ResponseStarted().
 EVENT_TYPE(URL_REQUEST_START)
 
 // ------------------------------------------------------------------------
 // HttpCache
@@ skipping 97 matching lines @@
 EVENT_TYPE(SOCKS5_GREET_WRITE)
 
 // The time spent waiting for the "greeting" response from the SOCKS server.
 EVENT_TYPE(SOCKS5_GREET_READ)
 
 // The time spent sending the CONNECT request to the SOCKS server.
 EVENT_TYPE(SOCKS5_HANDSHAKE_WRITE)
 
 // The time spent waiting for the response to the CONNECT request.
 EVENT_TYPE(SOCKS5_HANDSHAKE_READ)