Move settings setup for PDF and cloud print into single location in PrintingContext

printing/print_settings_initializer_gtk.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_settings_initializer_gtk.h"
 
 #include <gtk/gtk.h>
 #include <gtk/gtkunixprint.h>
 
 #include "base/strings/string16.h"
@@ skipping 25 matching lines @@
         gtk_page_setup_get_paper_width(page_setup, GTK_UNIT_INCH) * dpi,
         gtk_page_setup_get_paper_height(page_setup, GTK_UNIT_INCH) * dpi);
     printable_area_device_units.SetRect(
         gtk_page_setup_get_left_margin(page_setup, GTK_UNIT_INCH) * dpi,
         gtk_page_setup_get_top_margin(page_setup, GTK_UNIT_INCH) * dpi,
         gtk_page_setup_get_page_width(page_setup, GTK_UNIT_INCH) * dpi,
         gtk_page_setup_get_page_height(page_setup, GTK_UNIT_INCH) * dpi);
   } else {
     // Use default values if we cannot get valid values from the print dialog.
     dpi = kPixelsPerInch;
-    double page_width_in_pixel = 8.5 * dpi;
-    double page_height_in_pixel = 11.0 * dpi;
+    double page_width_in_pixel = kLetterWidthInch * dpi;
+    double page_height_in_pixel = kLetterHeightInch * dpi;
     physical_size_device_units.SetSize(
         static_cast<int>(page_width_in_pixel),
         static_cast<int>(page_height_in_pixel));
     printable_area_device_units.SetRect(
         static_cast<int>(kLeftMarginInInch * dpi),
         static_cast<int>(kTopMarginInInch * dpi),
         page_width_in_pixel - (kLeftMarginInInch + kRightMarginInInch) * dpi,
         page_height_in_pixel - (kTopMarginInInch + kBottomMarginInInch) * dpi);
   }
 
   print_settings->set_dpi(dpi);
 
   // Note: With the normal GTK print dialog, when the user selects the landscape
   // orientation, all that does is change the paper size. Which seems to be
   // enough to render the right output and send it to the printer.
   // The orientation value stays as portrait and does not actually affect
   // printing.
   // Thus this is only useful in print preview mode, where we manually set the
   // orientation and change the paper size ourselves.
   GtkPageOrientation orientation = gtk_print_settings_get_orientation(settings);
   // Set before SetPrinterPrintableArea to make it flip area if necessary.
   print_settings->SetOrientation(orientation == GTK_PAGE_ORIENTATION_LANDSCAPE);
-
+  DCHECK_EQ(dpi, print_settings->device_units_per_inch());
   print_settings->SetPrinterPrintableArea(physical_size_device_units,
                                           printable_area_device_units,
-                                          dpi, true);
+                                          true);
 }
 
 const double PrintSettingsInitializerGtk::kTopMarginInInch = 0.25;
 const double PrintSettingsInitializerGtk::kBottomMarginInInch = 0.56;
 const double PrintSettingsInitializerGtk::kLeftMarginInInch = 0.25;
 const double PrintSettingsInitializerGtk::kRightMarginInInch = 0.25;
 
 }  // namespace printing