Add PrintedPage::GetCenteredPageContentRect so Mac and Win can share code.

printing/printed_page.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 PRINTING_PRINTED_PAGE_H_
 #define PRINTING_PRINTED_PAGE_H_
 
 #include "base/ref_counted.h"
 #include "base/scoped_ptr.h"
 #include "gfx/rect.h"
@@ skipping 16 matching lines @@
               const gfx::Rect& page_content_rect,
               bool has_visible_overlays);
 
   // Getters
   int page_number() const { return page_number_; }
   const NativeMetafile* native_metafile() const;
   const gfx::Size& page_size() const { return page_size_; }
   const gfx::Rect& page_content_rect() const { return page_content_rect_; }
   bool has_visible_overlays() const { return has_visible_overlays_; }
 
+  // Get page content rect adjusted based on
+  // http://dev.w3.org/csswg/css3-page/#positioning-page-box
+  void GetCenteredPageContentRect(const gfx::Size& paper_size,
+                                  gfx::Rect* content_rect) const;
+
  private:
   friend class base::RefCountedThreadSafe<PrintedPage>;
 
   ~PrintedPage();
 
   // Page number inside the printed document.
   const int page_number_;
 
   // Actual paint data.
   const scoped_ptr<NativeMetafile> native_metafile_;
 
   // The physical page size. To support multiple page formats inside on print
   // job.
   const gfx::Size page_size_;
 
   // The printable area of the page.
   const gfx::Rect page_content_rect_;
 
   // True if the overlays should be visible in this page.
   bool has_visible_overlays_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintedPage);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_PRINTED_PAGE_H_