LogDog: Add Butler stream server package.

client/internal/logdog/butler/streamserver/namedPipe_windows.go

Index: client/internal/logdog/butler/streamserver/namedPipe_windows.go
diff --git a/client/internal/logdog/butler/streamserver/namedPipe_windows.go b/client/internal/logdog/butler/streamserver/namedPipe_windows.go
new file mode 100644
index 0000000000000000000000000000000000000000..ea6667235764203cd1001e15086fe73a12231712
--- /dev/null
+++ b/client/internal/logdog/butler/streamserver/namedPipe_windows.go
@@ -0,0 +1,22 @@
+// 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 streamserver
+
+import (
+	"net"
+
+	log "github.com/luci/luci-go/common/logging"
+	"golang.org/x/net/context"
+	npipe "gopkg.in/natefinch/npipe.v2"
+)
+
+// NewNamedPipeServer instantiates a new Windows named pipe server instance.
+func NewNamedPipeServer(ctx context.Context, address string) StreamServer {
+	ctx = log.SetField(ctx, "address", address)
+	return createNamedPipeServer(ctx, func() (net.Listener, error) {
+		log.Debugf(ctx, "Creating Windows server socket Listener.")
+		return npipe.Listen(address)
+	})
+}