Add Print Selection support to Chrome. This change is fairly involved since ...

chrome/browser/printing/page_range.h

 // Copyright (c) 2006-2008 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_BROWSER_PRINTING_PAGE_RANGE_H__
 #define CHROME_BROWSER_PRINTING_PAGE_RANGE_H__
 
 #include <vector>
 
 namespace printing {
 
 struct PageRange;
 
 typedef std::vector<PageRange> PageRanges;
 
 // Print range is inclusive. To select one page, set from == to.
 struct PageRange {
   int from;
   int to;
 
   bool operator==(const PageRange& rhs) const {
     return from == rhs.from && to == rhs.to;
   }
 
   // Retrieves the sorted list of unique pages in the page ranges.
   static std::vector<int> GetPages(const PageRanges& ranges);
+
+  // Gets the total number of pages.
+  static int GetTotalPages(const PageRanges& ranges);
 };
 
 }  // namespace printing
 
 #endif  // CHROME_BROWSER_PRINTING_PAGE_RANGE_H__