[Print Preview] Modified PP_PrintSettings_Dev interface to support auto fit to page functionality.

chrome/renderer/mock_printer.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_RENDERER_MOCK_PRINTER_H_
 #define CHROME_RENDERER_MOCK_PRINTER_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 125 matching lines @@
 
   // The output of a printing job.
   int number_pages_;
   int page_number_;
 
   // Used only in the preview sequence.
   bool is_first_request_;
   bool print_to_pdf_;
   int preview_request_id_;
 
+  // Used only while printing a pdf file.
+  bool fit_pdf_page_to_paper_size_;
+
   // Used for displaying headers and footers.
   bool display_header_footer_;
   string16 date_;
   string16 title_;
   string16 url_;
 
   // Used for generating invalid settings.
   bool use_invalid_settings_;
 
   std::vector<scoped_refptr<MockPrinterPage> > pages_;
 
   DISALLOW_COPY_AND_ASSIGN(MockPrinter);
 };
 
 #endif  // CHROME_RENDERER_MOCK_PRINTER_H_