Move useful printing backend code from chrome/service/cloud_print to printing...

printing/backend/cups_helper.h

+// Copyright (c) 2010 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.
+
+#ifndef PRINTING_BACKEND_CUPS_HELPER_H_
+#define PRINTING_BACKEND_CUPS_HELPER_H_
+#pragma once
+
+#include <cups/cups.h>
+
+class GURL;
+
+// These are helper functions for dealing with CUPS.
+namespace printing {
+
+// Helper wrapper around http_t structure, with connection and cleanup
+// functionality.
+class HttpConnectionCUPS {
+ public:
+  explicit HttpConnectionCUPS(const GURL& print_server_url);
+  ~HttpConnectionCUPS();
+
+  http_t* http();
+
+ private:
+  http_t* http_;
+};
+
+}  // namespace printing
+
+#endif  // PRINTING_BACKEND_CUPS_HELPER_H_