Print Preview: Fixing behavior of event listeners.

chrome/renderer/mock_printer.h

 // 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.
 
 #ifndef CHROME_RENDERER_MOCK_PRINTER_H_
 #define CHROME_RENDERER_MOCK_PRINTER_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 111 matching lines @@
   // Cookie for the document to ensure correctness.
   int document_cookie_;
   int current_document_cookie_;
 
   // The current status of this printer.
   Status printer_status_;
 
   // The output of a printing job.
   int number_pages_;
   int page_number_;
+
+  // Used only in the preview sequence.
+  bool is_first_request_;
+  int preview_request_id_;
+
   std::vector<scoped_refptr<MockPrinterPage> > pages_;
 
   DISALLOW_COPY_AND_ASSIGN(MockPrinter);
 };
 
 #endif  // CHROME_RENDERER_MOCK_PRINTER_H_