Print preview page selection should not require a rerendering of draft pages.

printing/print_job_constants.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 "printing/print_job_constants.h"
 
 namespace printing {
 
 // Unique ID sent along every preview request.
 const char kPreviewRequestID[] = "requestID";
 
 // Print using cloud print: true if selected, false if not.
 const char kSettingCloudPrintId[] = "cloudPrintID";
 
 // Print job setting 'collate'.
 const char kSettingCollate[] = "collate";
 
 // Print out color: true for color, false for grayscale.
 const char kSettingColor[] = "color";
 
 // Number of copies.
 const char kSettingCopies[] = "copies";
 
 // Device name: Unique printer identifier.
 const char kSettingDeviceName[] = "deviceName";
 
 // Print job duplex mode.
 const char kSettingDuplexMode[] = "duplex";
 
+// True, when a new set of draft preview data is required.
+const char kSettingGenerateDraftData[] = "generateDraftData";
+
 // Page orientation: true for landscape, false for portrait.
 const char kSettingLandscape[] = "landscape";
 
 // A page range.
 const char kSettingPageRange[] = "pageRange";
 
 // The first page of a page range. (1-based)
 const char kSettingPageRangeFrom[] = "from";
 
 // The last page of a page range. (1-based)
 const char kSettingPageRangeTo[] = "to";
 
 // Printer name.
 const char kSettingPrinterName[] = "printerName";
 
 // Print to PDF option: true if selected, false if not.
 const char kSettingPrintToPDF[] = "printToPDF";
 
 // Indices used to represent first page, invalid page and complete
 // preview document.
 const int FIRST_PAGE_INDEX = 0;
 const int COMPLETE_PREVIEW_DOCUMENT_INDEX = -1;
 const int INVALID_PAGE_INDEX = -2;
 
 }  // namespace printing