Introduce concept of provisional destinations to print preview

chrome/browser/ui/webui/print_preview/print_preview_handler.h

 // Copyright (c) 2012 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_PRINT_PREVIEW_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_HANDLER_H_
 
 #include <string>
 
 #include "base/files/file_path.h"
@@ skipping 297 matching lines @@
   void EnsureExtensionPrinterHandlerSet();
 
   // Called when a list of printers is reported by an extension.
   // |printers|: The list of printers managed by the extension.
   // |done|: Whether all the extensions have reported the list of printers
   //     they manage.
   void OnGotPrintersForExtension(const base::ListValue& printers, bool done);
 
   // Called when an extension reports information for a USB printer it has just
   // been granted access to.
-  // |extension_id|: The extension that was queried.
-  // |device_id|: The id of the USB device.
+  // |provisional_destination_id|: ID used to identify the provisional print
+  //     destination for the USB printer in print preview UI.
   // |printer_info|: The data reported by the extension.
-  void OnGotExtensionUsbPrinterInfo(const std::string& extension_id,
-                                    int device_id,
-                                    const base::DictionaryValue& printer_info);
+  void OnGotExtensionUsbPrinterInfo(
+      const std::string& provisional_destination_id,
+      const base::DictionaryValue& printer_info);
 
   // Called when an extension reports the set of print capabilites for a
   // printer.
   // |printer_id|: The id of the printer whose capabilities are reported.
   // |capabilities|: The printer capabilities.
   void OnGotExtensionPrinterCapabilities(
       const std::string& printer_id,
       const base::DictionaryValue& capabilities);
 
   // Called when an extension print job is completed.
@@ skipping 57 matching lines @@
   // Notifies tests that want to know if the PDF has been saved. This doesn't
   // notify the test if it was a successful save, only that it was attempted.
   base::Closure pdf_file_saved_closure_;
 
   base::WeakPtrFactory<PrintPreviewHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_HANDLER_H_