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

net/ftp/ftp_transaction.h

Index: net/ftp/ftp_transaction.h
===================================================================
--- net/ftp/ftp_transaction.h	(revision 23124)
+++ net/ftp/ftp_transaction.h	(working copy)
@@ -13,6 +13,7 @@
 
 class FtpRequestInfo;
 class FtpResponseInfo;
+class LoadLog;
 
 // Represents a single FTP transaction.
 class FtpTransaction {
@@ -34,7 +35,9 @@
   //
   // NOTE: The transaction is not responsible for deleting the callback object.
   //
-  virtual int Start(const FtpRequestInfo* request_info,
+  // Profiling information for the request is saved to |load_log| if non-NULL.
+  virtual int Start(LoadLog* load_log,
+                    const FtpRequestInfo* request_info,
                     CompletionCallback* callback) = 0;
 
   // Restarts the FTP transaction with authentication credentials.