Update UI for extension destinations in print preview destination list

extensions/browser/api/printer_provider/printer_provider_api.cc

 // Copyright 2015 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.
 
 #include "extensions/browser/api/printer_provider/printer_provider_api.h"
 
 #include <map>
 #include <set>
 #include <utility>
 #include <vector>
@@ skipping 506 matching lines @@
 
   // Update some printer description properties to better identify the extension
   // managing the printer.
   for (size_t i = 0; i < result.size(); ++i) {
     scoped_ptr<base::DictionaryValue> printer(result[i]->ToValue());
     std::string internal_printer_id;
     CHECK(printer->GetString("id", &internal_printer_id));
     printer->SetString("id",
                        GeneratePrinterId(extension->id(), internal_printer_id));
     printer->SetString("extensionId", extension->id());
+    printer->SetString("extensionName", extension->name());
     printer_list.Append(printer.release());
   }
 
   pending_get_printers_requests_.CompleteForExtension(extension->id(),
                                                       request_id, printer_list);
 }
 
 void PrinterProviderAPIImpl::OnGetCapabilityResult(
     const Extension* extension,
     int request_id,
@@ skipping 58 matching lines @@
   return new PrinterProviderAPIImpl(context);
 }
 
 // static
 std::string PrinterProviderAPI::GetDefaultPrintError() {
   return core_api::printer_provider_internal::ToString(
       core_api::printer_provider_internal::PRINT_ERROR_FAILED);
 }
 
 }  // namespace extensions