Create a new print backend for the updated CUPS APIs

printing/backend/cups_connection.h

Index: printing/backend/cups_connection.h
diff --git a/printing/backend/cups_connection.h b/printing/backend/cups_connection.h
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index 0000000000000000000000000000000000000000..5429edb32ea550e096cf2fec6156a066ccb23d7e
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+++ b/printing/backend/cups_connection.h
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+// Copyright 2016 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_CONNECTION_H_
+#define PRINTING_BACKEND_CUPS_CONNECTION_H_
+
+#include <cups/cups.h>
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "printing/backend/cups_deleters.h"
+#include "printing/backend/cups_printer.h"
+#include "printing/printing_export.h"
+#include "url/gurl.h"
+
+namespace printing {
+
+// Represents a connection to a CUPS server.
+class PRINTING_EXPORT CupsConnection {
+ public:
+  CupsConnection(const GURL& print_server_url,
+                 http_encryption_t encryption,
+                 bool blocking);
+
+  CupsConnection(CupsConnection&& connection);
+
+  ~CupsConnection();
+
+  // Returns a vector of all the printers configure on the CUPS server.
+  std::vector<CupsPrinter> GetDests();
+
+  // Returns a printer for |printer_name| from the connected server.
+  std::unique_ptr<CupsPrinter> GetPrinter(const std::string& printer_name);
+
+  std::string server_name() const;
+
+  int last_error() const;
+
+ private:
+  // lazily initialize http connection
+  bool Connect();
+
+  GURL print_server_url_;
+  http_encryption_t cups_encryption_;
+  bool blocking_;
+
+  std::unique_ptr<http_t, HttpDeleter> cups_http_;
+
+  DISALLOW_COPY_AND_ASSIGN(CupsConnection);
+};
+
+}  // namespace printing
+
+#endif  // PRINTING_BACKEND_CUPS_CONNECTION_H_