Create a new print backend for the updated CUPS APIs

printing/backend/cups_connection.h

+// 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 "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:
+  explicit CupsConnection(const GURL& print_server_url,
+                          http_encryption_t encryption,
+                          bool blocking);
+
+  CupsConnection(const CupsConnection& connection);
+
+  ~CupsConnection();
+
+  // Returns the number of destinations and populates |destinations|.
+  std::vector<CupsPrinter> GetDests();
+
+  // Returns a printer for |printer_name| from the connected server.
+  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::shared_ptr<http_t> cups_http_;

[Lei Zhang, 2016/07/08 01:19:50]

Currently banned: https://chromium-cpp.appspot.com/

[skau, 2016/07/08 21:24:08]

I've switched to a WeakPtr implementation.  Lmk what you think.

+};
+
+}  // namespace printing
+
+#endif  // PRINTING_BACKEND_CUPS_CONNECTION_H_