Add a method to query IPP printers for attributes.

chrome/browser/chromeos/printing/printer_info.h

+// Copyright 2017 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 CHROME_BROWSER_CHROMEOS_PRINTING_PRINTER_INFO_H_
+#define CHROME_BROWSER_CHROMEOS_PRINTING_PRINTER_INFO_H_
+
+#include <string>
+
+#include "base/callback_forward.h"
+
+namespace chromeos {
+
+// Callback for basic printer information.  |success| indicates if the request
+// succeeded at all.  |make| represents the printer manufacturer.  |model| is
+// the printer model.  |autoconf| indicates if we think we can compute the
+// printer capabilites without a PPD.
+using PrinterInfoCallback = base::Callback<void(bool success,
+                                                const std::string& make,
+                                                const std::string& model,
+                                                bool autoconf)>;
+
+// Dispatch an IPP request to |host| on |port| for |path| to obtain
+// basic printer information.
+void QueryIppPrinter(const std::string& host,
+                     const int port,
+                     const std::string& path,
+                     const PrinterInfoCallback& callback);
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_PRINTING_PRINTER_INFO_H_