Add Socket::ReadIfReady()

net/socket/tcp_socket_win.cc

Index: net/socket/tcp_socket_win.cc
diff --git a/net/socket/tcp_socket_win.cc b/net/socket/tcp_socket_win.cc
index 6bb5895eff18ff698f36b3ce3eed80cabdd400ed..2ec130ee1cbd68b2d50a38223091997d4015a914 100644
--- a/net/socket/tcp_socket_win.cc
+++ b/net/socket/tcp_socket_win.cc
@@ -497,6 +497,14 @@ int TCPSocketWin::Read(IOBuffer* buf,
   return DoRead(buf, buf_len, callback);
 }
 
+int TCPSocketWin::ReadIfReady(IOBuffer* buf,
+                              int buf_len,
+                              const CompletionCallback& callback) {
+  DCHECK(CalledOnValidThread());
+  // TODO(xunjieli): Implement this.
+  return ERR_READ_IF_READY_NOT_IMPLEMENTED;
+}
+
 int TCPSocketWin::Write(IOBuffer* buf,
                         int buf_len,
                         const CompletionCallback& callback) {