Introduce concept of provisional destinations to print preview

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

Index: chrome/browser/ui/webui/print_preview/print_preview_handler.cc
diff --git a/chrome/browser/ui/webui/print_preview/print_preview_handler.cc b/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
index e9caadcb207adb7bbf5c135681030e5b1073240b..383b1bee33876a7a3437428d571ee04276f2b5bb 100644
--- a/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
+++ b/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
@@ -752,18 +752,21 @@ void PrintPreviewHandler::HandleGetExtensionPrinters(
 
 void PrintPreviewHandler::HandleGrantExtensionUsbPrinterAccess(
     const base::ListValue* args) {
+  std::string provisional_destination_id;
+  bool ok = args->GetString(0, &provisional_destination_id);
+  DCHECK(ok);
   std::string extension_id;
-  bool ok = args->GetString(0, &extension_id);
+  ok = args->GetString(1, &extension_id);
   DCHECK(ok);
   int device_id;
-  ok = args->GetInteger(1, &device_id);
+  ok = args->GetInteger(2, &device_id);
   DCHECK(ok);
 
   EnsureExtensionPrinterHandlerSet();
   extension_printer_handler_->StartGrantUsbPrinterAccess(
       extension_id, device_id,
       base::Bind(&PrintPreviewHandler::OnGotExtensionUsbPrinterInfo,
-                 base::Unretained(this), extension_id, device_id));
+                 base::Unretained(this), provisional_destination_id));
 }
 
 void PrintPreviewHandler::HandleGetExtensionPrinterCapabilities(
@@ -1719,17 +1722,19 @@ void PrintPreviewHandler::OnGotPrintersForExtension(
 }
 
 void PrintPreviewHandler::OnGotExtensionUsbPrinterInfo(
-    const std::string& extension_id,
-    int device_id,
+    const std::string& provisional_destination_id,
     const base::DictionaryValue& printer_info) {
   if (printer_info.empty()) {
-    web_ui()->CallJavascriptFunction("failedToGetExtensionUsbPrinterInfo",
-                                     base::StringValue(extension_id),
-                                     base::FundamentalValue(device_id));
+    web_ui()->CallJavascriptFunction(
+        "failedToResolveProvisionalDestination",
+        base::StringValue(provisional_destination_id));
     return;
   }
 
-  web_ui()->CallJavascriptFunction("onExtensionUsbPrinterAdded", printer_info);
+  web_ui()->CallJavascriptFunction(
+    "onProvisionalDestinationResolved",
+    base::StringValue(provisional_destination_id),
+    printer_info);
 }
 
 void PrintPreviewHandler::OnGotExtensionPrinterCapabilities(