Add methods for setting socket buffers to the Socket

net/socket/tcp_client_socket_libevent.h

Index: net/socket/tcp_client_socket_libevent.h
===================================================================
--- net/socket/tcp_client_socket_libevent.h	(revision 25133)
+++ net/socket/tcp_client_socket_libevent.h	(working copy)
@@ -39,6 +39,8 @@
   // Full duplex mode (reading and writing at the same time) is supported
   virtual int Read(IOBuffer* buf, int buf_len, CompletionCallback* callback);
   virtual int Write(IOBuffer* buf, int buf_len, CompletionCallback* callback);
+  virtual bool SetReceiveBufferSize(int32 size);
+  virtual bool SetSendBufferSize(int32 size);
 
   // Identical to posix system call of same name
   // Needed by ssl_client_socket_nss