PrintPreview: Display print preview failed error message in the restored print preview tab.

chrome/browser/ui/webui/print_preview_handler.cc

 // Copyright (c) 2011 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 "chrome/browser/ui/webui/print_preview_handler.h"
 
 #include <string>
 
 #include "base/i18n/file_util_icu.h"
 #include "base/json/json_reader.h"
@@ skipping 257 matching lines @@
   scoped_refptr<PrintSystemTaskProxy> task =
       new PrintSystemTaskProxy(AsWeakPtr(), print_backend_.get());
   BrowserThread::PostTask(
       BrowserThread::FILE, FROM_HERE,
       NewRunnableMethod(task.get(),
                         &PrintSystemTaskProxy::EnumeratePrinters));
 }
 
 void PrintPreviewHandler::HandleGetPreview(const ListValue* args) {
   TabContents* initiator_tab = GetInitiatorTab();
-  if (!initiator_tab)
+  if (!initiator_tab) {
+    web_ui_->CallJavascriptFunction("printPreviewFailed");
     return;
+  }
   scoped_ptr<DictionaryValue> settings(GetSettingsDictionary(args));
   if (!settings.get())
     return;
 
   RenderViewHost* rvh = initiator_tab->render_view_host();
   rvh->Send(new PrintMsg_PrintPreview(rvh->routing_id(), *settings));
 }
 
 void PrintPreviewHandler::HandlePrint(const ListValue* args) {
   TabContents* initiator_tab = GetInitiatorTab();
@@ skipping 155 matching lines @@
   metafile->InitFromData(data.first->memory(), data.second);
 
   // Updating last_saved_path_ to the newly selected folder.
   *last_saved_path_ = path.DirName();
 
   PrintToPdfTask* task = new PrintToPdfTask(metafile, path);
   BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE, task);
 
   ActivateInitiatorTabAndClosePreviewTab();
 }