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

net/socket/client_socket_handle.h

Index: net/socket/client_socket_handle.h
===================================================================
--- net/socket/client_socket_handle.h	(revision 23124)
+++ net/socket/client_socket_handle.h	(working copy)
@@ -46,7 +46,9 @@
   //
   // Init may be called multiple times.
   //
-  int Init(const std::string& group_name,
+  // Profiling information for the request is saved to |load_log| if non-NULL.
+  int Init(LoadLog* load_log,
+           const std::string& group_name,
            const HostResolver::RequestInfo& resolve_info,
            int priority,
            CompletionCallback* callback);