Register and select printer on click.

chrome/browser/ui/webui/print_preview/printer_capabilities.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 CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINTER_CAPABILITIES_H_
+#define CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINTER_CAPABILITIES_H_
+
+#include <memory>
+#include <string>
+#include <utility>
+
+#include "base/values.h"
+#include "printing/printing_export.h"

[Lei Zhang, 2016/11/02 23:09:22]

Nothing is being exported here?

[skau, 2016/11/03 22:38:08]

Done.

+
+namespace printing {
+
+struct PrinterBasicInfo;
+
+// Printer capability setting keys.
+extern const char kPrinterId[];
+extern const char kPrinterCapabilities[];
+
+// Extracts the printer display name and description from the
+// appropriate fields in |printer| for the platform.
+std::pair<std::string, std::string> GetPrinterNameAndDescription(
+    const PrinterBasicInfo& printer);
+
+// Constructs the JSON representing printer capabilities information suitable
+// for passing to the WebUI.
+std::unique_ptr<base::DictionaryValue> GetSettingsDictionary(
+    const std::string& device_name,

[Lei Zhang, 2016/11/02 23:09:22]

Please explain what this is exactly, as PrinterBasicInfo already has a
printer_name field, which sometimes means something else.

[skau, 2016/11/03 22:38:08]

Done.

+    const PrinterBasicInfo& basic_info);
+
+}  // namespace printing
+
+#endif  // CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINTER_CAPABILITIES_H_