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

net/base/net_log_event_type_list.h

Index: net/base/net_log_event_type_list.h
===================================================================
--- net/base/net_log_event_type_list.h	(revision 40318)
+++ net/base/net_log_event_type_list.h	(working copy)
@@ -3,7 +3,7 @@
 // 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
@@ -13,6 +13,11 @@
 // 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
 // ------------------------------------------------------------------------
@@ -118,6 +123,16 @@
 // 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
 // ------------------------------------------------------------------------