[Print Preview]: Added code to support pdf fit to page functionality.

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

 // 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.
 
 #include "chrome/browser/ui/webui/print_preview/print_preview_data_source.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/memory/ref_counted_memory.h"
@@ skipping 109 matching lines @@
                      IDS_PRINT_PREVIEW_PAGE_RANGE_INSTRUCTION);
   AddLocalizedString("copiesInstruction", IDS_PRINT_PREVIEW_COPIES_INSTRUCTION);
   AddLocalizedString("signIn", IDS_PRINT_PREVIEW_SIGN_IN);
   AddLocalizedString("managePrinters", IDS_PRINT_PREVIEW_MANAGE_PRINTERS);
   AddLocalizedString("incrementTitle", IDS_PRINT_PREVIEW_INCREMENT_TITLE);
   AddLocalizedString("decrementTitle", IDS_PRINT_PREVIEW_DECREMENT_TITLE);
   AddLocalizedString("printPagesLabel", IDS_PRINT_PREVIEW_PRINT_PAGES_LABEL);
   AddLocalizedString("optionsLabel", IDS_PRINT_PREVIEW_OPTIONS_LABEL);
   AddLocalizedString("optionHeaderFooter",
                      IDS_PRINT_PREVIEW_OPTION_HEADER_FOOTER);
+  AddLocalizedString("optionFitToPage",
+                     IDS_PRINT_PREVIEW_OPTION_FIT_TO_PAGE);
   AddLocalizedString("marginsLabel", IDS_PRINT_PREVIEW_MARGINS_LABEL);
   AddLocalizedString("defaultMargins", IDS_PRINT_PREVIEW_DEFAULT_MARGINS);
   AddLocalizedString("noMargins", IDS_PRINT_PREVIEW_NO_MARGINS);
   AddLocalizedString("customMargins", IDS_PRINT_PREVIEW_CUSTOM_MARGINS);
   AddLocalizedString("minimumMargins", IDS_PRINT_PREVIEW_MINIMUM_MARGINS);
   AddLocalizedString("top", IDS_PRINT_PREVIEW_TOP_MARGIN_LABEL);
   AddLocalizedString("bottom", IDS_PRINT_PREVIEW_BOTTOM_MARGIN_LABEL);
   AddLocalizedString("left", IDS_PRINT_PREVIEW_LEFT_MARGIN_LABEL);
   AddLocalizedString("right", IDS_PRINT_PREVIEW_RIGHT_MARGIN_LABEL);
 
@@ skipping 28 matching lines @@
         url_substr[0], page_index, &data);
   }
   if (data.get()) {
     SendResponse(request_id, data);
     return;
   }
   // Invalid request.
   scoped_refptr<base::RefCountedBytes> empty_bytes(new base::RefCountedBytes);
   SendResponse(request_id, empty_bytes);
 }