LogDog: Add Butler stream server package.

client/logdog/butlerlib/streamclient/client_npipe_windows.go

Index: client/logdog/butlerlib/streamclient/client_npipe_windows.go
diff --git a/client/logdog/butlerlib/streamclient/client_npipe_windows.go b/client/logdog/butlerlib/streamclient/client_npipe_windows.go
new file mode 100644
index 0000000000000000000000000000000000000000..fe92ccb79b8f7c0ad0d3ed16047f1cbfca4a4a93
--- /dev/null
+++ b/client/logdog/butlerlib/streamclient/client_npipe_windows.go
@@ -0,0 +1,30 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package streamclient
+
+import (
+	"errors"
+	"fmt"
+	"io"
+
+	"gopkg.in/natefinch/npipe.v2"
+)
+
+// Register POSIX-only protocols.
+func init() {
+	registerProtocol("net.pipe", newNamedPipeClient)
+}
+
+// newNamedPipeClient creates a new Client instance bound to a named pipe stream
+// server.
+func newNamedPipeClient(path string) (Client, error) {
+	if path == "" {
+		return nil, errors.New("streamclient: cannot have empty named pipe path")
+	}
+
+	return &clientImpl{func() (io.WriteCloser, error) {
+		return npipe.Dial(fmt.Sprintf(`\\.\pipe\%s`, path))
+	}}
+}